Yes, but 'fps' with room speed unlocked will give you fps actual. Can't get a better benchmark than that.
Anyway, I have advised you how to detect if vSync is on or not. What you do with that information is up to you.
As a side note with the way the internals of DirectX 11 (Windows Export) work, you don't enable or disable vSync as such anymore, like you used to with DirectX 9. It is merely a parameter on the Present() call, albeit done in GM's internals. 0 - Immediate, 1 - VSync, 2 - Half VSync, and 4 - Quarter Vsync. Which can be modified on a per frame basis. But, that's all beyond the scope of this topic and a bit of side trivia.