UPDATE 12/05: There had recently been reports that Nikon was struggling with delays for its latest Z-mount lenses. This was partly due to the fact that Nikon had only made a single development announcement for the upcoming Nikon Z9 – but hadn't mentioned anything about the planned Z-mount lenses that were due for announcement.
However, TechRadar recently asked Nikon how much truth there was to these rumors and received a definitive answer, being told that "there is no such delay".
https://www.digitalcameraworld.com/news/nikon-drops-the-ball-up-to-five-nikkor-z-lenses-delayed