To date, only Nikon Professional Services members were able to get a Z9. Even among that quite small audience, orders made in October are still being delivered now. Emails from retailers, though, indicate that they are about to start processing orders of Z9 units to non NPS members for delivery in mid-February.
The Z9 is getting very positive reviews, comparing favorably to the Sony A1 at significantly less cost, and blowing away the Canon R3’s relatively limited resolution.