I would think the GOP is prepared in pivotal states with late counting

Shouldnt they legally be able to:

Check the late votes to see if they were counted twice

Take the voter rolls and see if the person was actually eligible to vote (ie they are not one of the millions sitting on voter rolls who moved out of the state years ago).

If there are enough errors have the supreme court rule in favor of a revote in person in the affected areas to prevent the nonsense in those districts.

It would not only capture the "harvested votes" but the votes (using people who no longer live in the state) that were dumped in tranches, in the mail, before the cut off date (my biggest fear, that while we are watching the aforementioned, they have already cooked the vote).