You mean state electors, what's the chance that enough of them are faithless?
In 2016, a total of 10 electors cast faithless ballots, with seven—the highest since 1912—actually counting. Trump lost two electoral votes, and Hillary Clinton lost five. That wasn't enough to change the outcome
Biden currently has 290 EC votes, may get more yet but going on the 290 he has there would need to be at least 21 faithless electors presuming none are faithless to Biden's favour
