The perception is that Dems have voted (in record numbers) early, but Republicans will be the ones turning out on the day (today).
From what I’m hearing on the news, and seeing on my FB feed from American friends, many Dems are waiting to do it today, and in person. They are so concerned that postal votes won’t get through, that they want to hand it in, in person. See it going safely into the ballot.
So, take heart from the high numbers showing up in person.