Okay, so here's my question: if a state is waiting on 50k uncounted mail in ballots but Biden has a 100k lead, will they call the state? How does this work? Are we likely to have many states that have enough uncounted ballots on election night to swing a state either way?
The media will make plenty of calls, and often with data that's considerably less clear (to the layman) than this. But it is not done frivolously. I don't recall any instances of states being called incorrectly since Florida in 2000 (if indeed it was).
The states themselves will count all the votes, give or take GOP lawsuits to prevent that, and will not declare winners until days or weeks after election day. Nobody will be paying attention when they do, because the media will have long since called those states, and correctly.