So what are the odds that the election is actually called on Tuesday night? 50%? 30%?
As Roy notes, it's probably going to depend on who is 'ahead'.
Polls indicate that mail-in & early voters were overwhelmingly registered as Democrats while conversely, those who intend to vote in-person on Tuesday tend to GOP.
Given that many states do not start counting mail-in & early ballots until after
Election Day, there is a very real chance that Trump will have a lead by the end of Tuesday night and will make lots of noise calling it a victory and that the race should be called. No credible media site will likely 'call it' in that scenario, though.
If, however, Biden is ahead based on the in-person voting, then I suspect some sites will 'call it' early based on the projection that the mail-in voting will only add to his margin. They really shouldn't though. All votes should be counted until it is mathematically impossible for the outcome to change before it is 'called'.