That's accurate, the GOP voters traditionally wait until Election Day, but that can also mean they are older, used to tradition, and if they live in certain States, Covid may be a influencing factor with that age group
Using words like "may be" is the right thing to do, IMHO. None of us really have any idea what is going to happen. We know that the polling companies can be very wrong and that "news" is untrustworthy and biased (all of us know it, even if some pretend they don't). The election of 2020 is like the year.. an enigma until it is over.