Today is the federal electoral safe harbor deadline. That means that the US Congress is obligated to accept the electoral certification from all states that have resolved their disputes. 49 states have as of Monday. Wisconsin is the only state that hasn't, but that doesn't matter much because Biden has more than enough electoral votes without Wisconsin's. Trump's lawyers claim otherwise, but in Bush vrs Gore the Supreme Court stopped Florida recounts so Florida would meet the safe harbor deadline.
The other problem for Trump's legal team is that Rudy is in the hospital with Covid-19 and Jenna Ellis has tested positive. I think the "legal challenge" phase of the Trump plan is about over.