Checking the stat gpu numbers and the profilegpu log in the default fps template project it seems that the NaniteBasePass item in the stat gpu list reflects 2 events:
NaniteBasepass after Nanite:VisBuffer and inside the Basepass stage.
Also, the profilegpu command in the output log emits the graphics and the compute queue as well, in a much more readable way than ever before.
On the other hand I agree, a UI representation would be more practical for everyone.