I can't imagine a ruling in his favor that doesn't give Biden the power to also commit whatever crimes he wants, but then again I'm not creative enough in the "moral degeneracy" department to qualify as a Republican supreme court justice.
They'll probably rule something asinine like "using a phone isn't treason" and, blinders firmly in place, blow right by the actual question.
I changed it because I was actually confused if this was about Jan 6th or about the Georgia case. Either way, they're going to have to argue that what he did isn't a crime because (whatever nonsense reason). There's no way they can argue a president is immune to prosecution for crimes, and for that reason alone, the kkkonservative justices are absolutely going to skirt the actual question and dismiss the case based on "not a crime".