New York (CNN) — The clock is ticking down on TikTok in America. A law that requires TikTok to find a new, non-Chinese owner or face a ban is scheduled to go into effect Sunday — and there is little indication the company is set to pull off a sale before then. That means 170 million Americans could lose access to a platform they use to find entertainment, news and community, or even run a business, after TikTok became the first new platform in years to pose a real competitive threat to American social media stalwarts like Instagram and YouTube. The Supreme Court on Friday upheld the law, bringing the ban one step closer. But although the ban deadline is now just two days away, there are still many unknowns about what exactly will happen. Will TikTok shut itself off entirely in the United States? That’s not what users or experts had expected, but one report indicated it may do just that. Will the outgoing President Joe Biden administration provide direction? That’s not sounding likely. Will incoming President Trump intervene? If the list of expected attendees at his inauguration is any indication, it’s likely he’ll try. Here’s what we know — and what we don’t — about the ban deadline day. Will my app go away? Experts had expected the app to be removed on Sunday from the Apple and Google app stores — which could face fines under the law for continuing to host TikTok after the deadline. That would mean anyone without the app already on their phones couldn’t download it, but existing users could continue accessing it, without security updates, until it eventually becomes glitchy or stops working. But a Biden administration official told CNN Thursday that the outgoing president plans to leave it to Trump to enforce the ban. “Our position on this has been clear: TikTok should continue to operate under American ownership. Given the timing of when it goes into effect over a holiday weekend a day before inauguration, it will be up to the next administration to implement,” the official said. That could mean that, given Trump takes office the day after the ban takes effect, there would be no one to explicitly instruct app stores to remove the platform on Sunday, potentially leaving them to decide for themselves whether to comply. But even if the app stores left TikTok alone, the company may decide to pull the plug itself. The Information reported Wednesday that TikTok was preparing to shut itself down entirely on Sunday and instead direct users to an informational page about the ban. So, users should mentally and emotionally prepare to potentially lose access to the app starting Sunday, unless they want to download a VPN to get around the ban. What’s Trump going to do? Although the idea of a TikTok ban was born during Trump’s first presidency, he has since made a 180-degree turn and said he wants to save the app. The complicating factor: the ban is set to go into effect one day before Trump takes office. Trump had asked the Supreme Court to temporarily pause the ban’s implementation to give him time, as president, to negotiate a sale of TikTok. And sources familiar with his plans told CNN on Wednesday that he was weighing whether to delay the ban and preserve Americans’ access to the platform while he works on a deal. TikTok CEO Shou Chew is set to be seated on the dais, alongside other leading tech CEOs, at Trump’s inauguration — perhaps a sign of just how serious the incoming president is about trying to save the app. And with some in Congress now suggesting that TikTok might need more time to find a buyer, Trump could find support in trying to push off the ban to a later date. The law gives the president the option to extend the ban by 90 days, but triggering the extension requires evidence that parties working on purchasing have made significant progress, including binding legal agreements for such a deal — and TikTok’s parent company, ByteDance, hasn’t publicly updated its stance that the app is not for sale. Is a sale still possible? Even if the TikTok ban does go into effect, a sale of the app to a non-Chinese owner could restore access for US users. A group formed by billionaire entrepreneur and former Los Angeles Dodgers owner Frank McCourt and including “Shark Tank”-famous investor Kevin O’Leary made a formal bid to buy TikTok from China-based ByteDance earlier this month. The group wants to buy TikTok’s US assets, albeit without the app’s beloved algorithm — which China has indicated it will not allow to be sold — and rebuild the platform with what they say would be a more transparent feed, and more user control over their data. Chinese officials have also reportedly discussed the possibility of selling TikTok to X owner Elon Musk, whom they might consider the friendliest possible American owner. Musk and ByteDance have not commented on the reports; TikTok called them “pure fiction.” McCourt told CNN on Thursday that while ByteDance’s bankers have confirmed receipt of his group’s offer, he expected the company was “waiting to hear what the Supreme Court does” before seriously engaging in any acquisition conversations. “But they haven’t told us to go fly a kite,” he said, adding that following the court’s ruling, “I hope we can have a robust conversation.” But here’s the thing: Even if TikTok is sold and Americans can keep using it, it will in many ways be a different app. Because China is almost certain to block the sale of the algorithm along with TikTok’s US assets, the app’s “For You” feed will have to be rebuilt by the new owner — which will be no easy task. Many tech giants have already spent years trying to replicate TikTok’s algorithm without quite succeeding. Spinning off an American-only version of TikTok could also mean the rest of the world has to download a new app to access US users’ content. The bottom line is, until Sunday — and probably extending at least into next week — there may be more questions than answers for TikTok users about the app’s future.