The case is about the court's home state ballot so in that sense they do have jurisdiction. The Colorado court isn't ruling on the Wyoming ballots, for example. Litigators in other jurisdictions can refer to the Colorado finding in their own cases.
Congress's role in the context of the 14th amendment is explicitly laid out. If SCOTUS wants to argue that the Colorado ruling isn't binding then the only remaining constitutional remedy is a Congressional vote to remove Trump's disability, meaning they have to vote to requalify him for office. Republicans can barely figure out how to put their slippers on in the morning let alone muster a 2/3 vote to forgive a traitor for trying to overthrow the country.