Update: we fixed what's causing this, so any new video uploads won't experience the same frozen, out-of-sync audio issue. If you've been waiting to post–go for it! We're now in the process of fixing all impacted videos, which will take a bit more time. Appreciate your patience!https://twitter.com/TeamYouTube/status/969298199658733568 …
It's hard to give an exact ETA but it's more in the 48-72 hour range for ALL impacted videos to be 100% fixed (eg. yours might be sooner but we have a lot of videos to work through). Hope this helps!