A new Nikon Z9 firmware update is rumored to be released tonight. I am not sure what exactly the new firmware will include, but my guess is the new RAW video update will be part of it since DaVinci Resolve recently added support for decoding Nikon RAW files:
Nikon continues to release firmware updates for older cameras – today we have a new firmware version 1.03 for the Nikon D780 DSLR camera (out of stock at most retailers: Adorama, Amazon, and B&H). Here are the changes: