The courts are going to be what determines this. Keep an eye on the results of the court cases and the facts coming in, the media is trying to downplay Trump's court wins so far as inconsequential.

I see this potentially playing out like a repeat of 2016, where Democrats cried that Hillary won the popular vote. This time, they will win when "all the votes" are counted (although we know it's fraudulent), but they may lose after the ballots received after deadlines are thrown out. This sets up an identical situation to 2016 where Trump wins legally, but the Democrats have enough ammunition to whine about Joe winning "in spirit" for four years.