I raced around and mailed a bunch of returns the first week of March, and all my refunds have now processed. Nordstrom took the longest. I'm not ordering anything else that might I need to return because of the hassle. I have a couple things from REI that need to go back, but their return policy is generous enough that I think I'll wait until stores re-open rather than pay the shipping cost.
I have one order (handmade sandals shipping from overseas) that posted a couple weeks ago, but I suspect getting through customs will take forever. I have another month to go before it's warm enough for sandals anyway, so as long as they show up eventually I'll be happy. I'm pretty confident they'll fit, but if not, I'm part of an FB group where I'd be able resell them pretty easily.