I don't see a win for Trump being done fairly or democratically, I see that when the first Votes are counted he may in fact come out the Winner. The next day, Postal Votes are to be counted, the majority of these could well be for Biden, and then would give him the overall win, but the postal Votes will be discredited, and then burned.
A challenge can be mounted in the Supreme Court, now heavily weighted in favour of Trump, but anyway, too late once the postal Votes are gone.
A possible Scenario ? We shall have to wait and see.