Here’s someone who did analysis of 2020 NYT time-series data, and is trying to make a case that the currently-contested states show odd patterns. Note that this would be circumstantial evidence at best , but still a little fishy when compared with the timeline: https://threadreaderapp.com/thread/1325592112428163072.html I made a GitHub repo of this analysis ported to Python3, with a quickstart and a matplotlib script…
Further, any analysis that compares returns over time and holds Florida up as the model state to match against needs to account for the fact that Florida was able to begin counting ballots early, because they passed state laws to do so†. PA and WI were legally prevented from counting ballots until election day. The returns over time are going to be much different in FL than in PA.
Here's another data point: you're about to see Biden's lead in New York open up and drive his popular vote victory even higher, because NY, which is a shitshow, is only now getting started counting all the mail-in votes. Obviously, the Democratic Party didn't launch a giant vote fraud operation in New York State, which they would have won even with a dead candidate.
† Every state should be like Florida, in this regard.