Filed Bug 287268 to add -devel version of #nvidia GPU driver on #FreeBSD #Bugzilla. This is planned to track basically New Feature Branch (NFB) of drivers, but if Production Branch of driver has larger version number, temporarily switches to it until new NFB is released upstream.
Note that Beta Branch of drivers are not tracked, although supports for them are incorporated in-tree in preparation of new NFB release, as versions on -devel branch.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287268

Now it's at 575.57.08.
https://www.nvidia.com/en-us/drivers/details/245539/

Currently, pruning of deprecated ports seems to be ongoing (and some of which are requested to be reverted), causing category Makefile to be modified. So holding to open review on Phablicator to see there could be more or not for maybe 1 or 2 more days.