A few notes to everyone doing their happy dances right now.
1. There is no hearing currently scheduled. The supreme court has a pretty set schedule and they only do hearings on Monday, Tuesday, and Wednesday, they release/write opinions on Thursday, and they conference primarily on Friday. As of this moment no emergency hearing has been set for Friday, so it seems unlikely there will be one.
2. Ironically the legal theory might to trip them up in this instance is the electoral college. Because we don't actually elect the president, but instead elect electors, it makes all presidential elections a purely state matter. The electors electing the president is arguably the federal one. Hell some states just had the legislature nominate them early on.
3. The Texas lawsuit does not allege the unconstitutionality of the 1876 Election law, which establishes things like the safe harbor date and the date for the electors to vote, among other things. Without that legal argument and associated ruling, the legislation is considered both legal and binding. Meaning either the time for remedy has past under safe harbor or there is barely more than a day before the electors vote.
Basically all this can really do now, unless the originalists are willing to bin the legal theories they have spent decades shaping, is provide political top cover for a Republican senator to contest things on January 6th.
He should have filed this weeks ago or specifically alleged the unconstitutionality of the 1876 election law.