Some states finalise their EC votes, I think.
The “finalization” is done when the state legislature ratifies and sends the results for certification by the state’s head of state (ie the governor). Once that’s done, the state sends the slate of electors to the electoral college on December 12 (?) and once
that election is done (and it is supposed to be a formality) then there’s nothing left to challenge.
December 8th is when internal state challenges are supposed to be resolved but there basically haven’t been any significant ones since Florida in 2000, let alone multiple frivolous suits filed in multiple states so who knows? I’d be amazed if they
didn’t keep going considering they are basically constitutional/legal outsider folk art. When you’ve already gone a million miles off piste, things like traditional deadlines can be safely ignored.