Second batch of polls just closed, including swing state Georgia.
The seven states to watch by polls closing time (all Eastern time) are:
Georgia: 7 pm
North Carolina: 7:30 pm
Pennsylvania: 8 pm
Arizona: 9 pm
Michigan 9 pm
Wisconsin: 9 pm
Nevada: 10 pm
Those seven are the states realistically considered in play. Most significant is Pennsylvania, which unfortunately will probably have somewhat slower results.
Iowa came up a couple days ago as possibly in contention based on the historically pretty solid polling by Ann Selzer. I’m still not putting stock in it, but for the sake of curiosity, closes at 9 pm. Iowa is six electoral votes; so a flip would change the tally by 12 in the Democrats’ favour. Again unlikely, but not outside of the realm of plausibility.
Any other state is not generally considered in play, and any upset results would be potentially very significant.