They are great, I enjoyed them a lot and have just rewatched BURNING at home with a lot of pleasure. I don't know the details of their post-theatrical release, I hope people will watch for them however they can see them. By "available streaming" do you mean like on Netflix or HBO or something like that?
Unfortunately I could not finish watching MUDBOUND, it seemed too deterministic to me and bothered me too much - to watch at home. Had I gone to see it in a theater of course I'd have stayed to the end. It's harder to finish films at home, sometimes.
I see you are right, Rachel Morrison is the first female ever nominated for the Best Cinematography Oscar. That is surprising. There are a number of good ones. Agnès Godard for Claire Denis comes to mind.