Nikon’s long-awaited firmware update for the Z6 and Z7 to add 4K ProRes raw video capability via an external recorder still isn’t here. We still don’t know when it’s going to be coming beyond “later this year”, although we do now know that this will not be a free firmware update. It will be a paid upgrade. That’s going to upset some people.
You can still shoot 10-bit N-Log video externally already without raw capabilities, although N-Log hasn’t exactly been the easiest to grade. Nikon has now, however, released two completely free LUT files for both the Nikon Z6 and Nikon Z7 cameras.