I’m in the same boat.
Jul 23 19:35:38 truenas kernel: NVRM: The NVIDIA GPU 0000:01:00.0 (PCI ID: 10de:2d04)
NVRM: NVIDIA 550.142 driver release.
NVRM: Please see 'Appendix A - Supported NVIDIA GPU Products'
NVRM: specific graphics driver download page at www.nvidia.com.
Jul 23 19:35:38 truenas kernel: NVRM: The NVIDIA probe routine failed for 1 device(s).
Jul 23 19:35:38 truenas kernel: NVRM: None of the NVIDIA devices were initialized.
Jul 23 19:35:38 truenas kernel: nvidia-nvlink: Unregistered Nvlink Core, major device number 235
Hopefully updated soon, see: Latest Nvidia drivers