This is going to be interesting to watch because there are so many confounding factors going on this year I suspect it's been near impossible to poll with a strong accuracy.
From a non American perspective it seems to me that Trump has a solid base of varying numbers in most states but the pomp and bluster of the rallies could make that appear bigger than it is.
Biden's campaign has been pretty woeful and I don't see much enthusiasm for him as a candidate but I'm not sure how much that matters because this election is basically a referendum on Trump. It's not really Trump v Biden it's Trump v Not Trump.
In some respects a clear landslide one way or the other would make things easier (not to be confused with better) for the US as a country but I think it's more likely to be close run. Followed by lot of accusations of fraud from both sides and contesting of ballots via the courts which will be a hideous and fraught time for everyone in the US.
Given that it's 2020 and this year has already sucked beyond recognition I'm not expecting anything less that a total shitshow.
Best of luck America however you vote. 