@matrix When and in what order things are counted in depends on the state due to laws and on the county due to policy or factors specific to the county.
Some places, for example, won't be allowed to count a single mail-in ballot until some time this morning. Others won't release any stats until Thursday.
So even if a ballot arrived two weeks ago, it might not be counted until hours or even days after election night.
@matrix Again, centuries of procedural cruft combined with 50 different rulesets about this make it a difficult question to answer.
Many states have added early voting, which just means we've replaced election day with an election season. You now don't disenfranchise people who work on election day (and that's going to be true no matter what day you pick, and the right will never ever for any reason allow a holiday to vote, again, they do NOT want people voting who would require a vacation day to vote), can handle more capacity (there's hundreds of millions more people here than when we built this system), and overall is a Very Good Thing.