I don't understand why everyone is accepting defeat with only 50% of the votes in...

The precincts are accounting for 7 million-ish votes at 98% check-in... But there were 7.3 million absentee ballots.

I know in normal cases you can extrapolate in-person percentages to approximate absentee votes and call a winner... But there was a statistically significant amount of people who, for some reason, wanted to do mail-in, so it is fair to believe that the current sample is not completely representative of the population.

How/when do we know when the absentee ballots are/will be counted?