First they have to rule on the merits of the complaint of a fraudulent outcome.
THEN they rule on what to do next (constitutionally hopefully, even though in this case, it would be more on constitutional intent).
Since the officially rigged election is a case of first impression (I think) then if the Court rules it was rigged, set another hearing to show uncontroverted documentation that Trump was the winner.
If the Court finds Trump the winner by whatever standard of proof they use, then SCOTUS declares Trump the winner and they give Biden a certain timeframe to vacate the White House.
If the Court doesn't find enough proof to declare Trump the winner, they would probably send the election back to the states for a re-election.
EITHER WAY, A DREAM COME TRUE!
If the Court doesn't find enough proof to declare Trump the winner, they would probably send the election back to the states for a re-election.
This will never happen as it would be itself an unconstitutional act.