You cannot tell anything about the election from party registration alone. HOWEVER, you can start to get meaningful information if you can triangulate with outside sources. If it's true that Kamala is leading among "already voted" in NC 55-43, given those registration statistics, that would be amazing. It wouldn't be game over yet, but it would put Kamala in a great position.
Where is this Marist poll being referred to. You know, if something is too good to be true -- well, I'd like to see just what that poll measured and how.
I found it. Eh, it's not a poll. It's just a cross-tab in the poll. So while it's still somewhat meaningful (because an already voted is even better than a likely vote, and because it does at least triangulate with the registration data a little bit), it's not overly so. I wouldn't make predictions from it.