Will be keeping an eye out for this, but I do assume TikTok users are generally some of the users least likely to jump ship from that platform.
the algorithm would also have to be better than tiktok's to get users interested (or TikTok gets banned from the US and everyone doesn't automatically switch to instagram reels), and with how adverse devs on the mastodon side of fedi are to them i imagine it won't be anywhere close to that level