I will take a slightly different approach. Since you are shooting the Canon R, consider going with the new RF 100 -500. A bit more expensive but with the extra reach (500mm vs 400mm) and the cropping advantage of the R over the Mk iii, I think that this will give you what you are looking for.
Another option for long reach is the new RF 800mm f11 IS. A reasonable price point and for outdoor shooting this is a great lens. With its IS, I was able to do quite a bit of hand held shooting on the Canon R. Good luck and stay safe

Matt Granger can do what he wants, especially since he's doing it to get more views of his you tube videos. As for dumping Nikon gear, I have absolutely no intension of dumping any of my Nikon gear. Of my more than 15 interchangable lens cameras, only 3 are Nikon, a D7200, D500 and D850 and they all work just as good as when I bought them, so no reason to get rid of them. As for Nikon being behind in the mirrorless category, well, I don't own any Nikon mirrorless cameras and probably never will. I personally see no reason to dispose of my perfectly good Nikon DSLR'S for MILC'S because the end product, the images, produced by the MILC'S are really no better than those produced by DSLR'S.
I have nothing against mirrorless cameras, I happen to own a couple, both Canon, that I use with an adapter and my EF mount lenses. They work just fine. As for crop sensor mirrorless cameras, the current trend, along with top end models, appears to be relatively affordable and entry level full frame mirrorless cameras. The manufacturers will market what the people want to buy.

Duke University tested masks using lasers. The wanted to see how much came through various kinds of masks. Neck gaiters are so porous that, as the person exhales through it, the fabric breaks up the larger particles into smaller one which will hang around longer They say that if you can see light coming through your mask, or if you can easily blow through it, it's not doing its job.

Unfortunately, the purpose of a mask is to protect the public from the wearer, so if people insist on wearing gaiters or pulling their T-shirt up over their noses, the virus will continue to spread faster, as it has been doing lately.