The driver supports DLSS and NGX Features via the NGX component starting with release series 450. However DLSS and NGX Feature support may differ between versions as these aren’t driver components, so it’s best to check in support audiences for those specific components.
With that in mind having worked on the implementation I know that:
DLSS has support for Linux with DLSS 2.0 and above. DLSS versions prior to 2.0 are not supported on Linux.