I suspect the supreme court will not overturn the election results, as it would probably lead to extreme violence: For every republican who thinks that the election was stolen, there's a Democrat who thinks that these legal battles are an attempt by the Republicans to steal the election.
Ultimately, undoing an election would likely result in greater unrest than letting the election sit as. There's more 'break points' in a change in transition. More places where people can refuse to do things, where violence can break out. Places where Biden could refuse to leave office, where the House could refuse... Inertia's a bitch, and changing the results at this state would give more people the opportunity to be obstructionist than simply allowing the election to proceed as it should.
Can you imagine the violence that would have occurred had, after Trump's election, the Supreme Court had ruled that actually Hilary had won? It would have been a lot of violence. And remember the head-space that the Democrats are in right now. If the Supreme Court hands the election to Trump, iiiit's going to be bad.
So, I don't think that this is going to amount to anything, regardless of the validity.