Again, even if there was standing (and an argument could be made for standing), it wouldn't matter, because even if they win this case, it won't change the outcome of the election.
They're primarily asking for SCOTUS to invalidate the appointment of 62 state Electors, at which point Biden would still win 244 - 232. They're also pleading with the court, with no real reason why this should happen, to allow the states' Legislatures to draft new Electors to cast their votes. But even if they could wrangle the Republican Legislatures of those four states to go along with this election-stealing scheme, three of those states (PA, WI, and MI) have Democrat governors who would veto any legislature on this, and the fourth, Brian Kemp of GA, has been blatant in his refusal to go along with Trump's shenanigans. PA, WI, and MI also don't appear to have veto-proof majorities in their legislatures in order to override their respective governors.