I was about to pull the trigger on a pair of Grip Grab covers for my Shimano MT5s but then COVID hit and they were forced to shut down their online sales temporarily. I see they are up and running again. They were great at answering any questions that I had with respect to their product line. I even sent them an image of my shoes and they provided a couple of recommendations based on my size and shoe style. It appears that one of the two covers that was recommended to me has sold out while the other option has a slightly lower waterproof rating though I may still order them. Feel free to reach out to them as I did and I'm sure they will respond in kind.
https://www.gripgrab.com/collections/shoe-covers