Actually what SCOTUS said is that they have to pass legislation- you know, a law. Then DOJ can charge Trump take him to trial. Will it require a jury? Whatever, it’s not the slam dunk case some think it would ba.
I thought that SCOTUS,in a recent ruling (IIRC it was that Colorado ballot ruling),said that if Congress were to pass some kind of "declaration" (my word) stating that DJT was unfit to be President that declaration would be sufficient to actually block him from becoming President.
Of course I could be wrong...never having attended law school.