We can't say that he is already done until the announcement will be made.
Right now, as we can see on the betting odds, it's safe to assume that Trump has a higher chance of losing.
With Arizona, Nevada, Wisconsin , Michigan all going to Biden right now and looking like there won't be any big changes in that situation unless some major trump ballots are suddenly "found" somewhere, I think we are already over. Interestingly I think both candidates broke the most voted candidate record right? It was something around 69 million for Obama before this election and Biden already moved beyond that and Trump probably will too. Interesting to see.