unless they stopped, there's a purple/white fast track pass that the CC would provide if asked
if you've got your UC boarding pass that may even be accepted - i've seen people just go to the fast track with no sign of a pass
as i'm usually not in the first batch out of the cabin, even with the pass i often just go to the normal desks as it can be faster as the fast track queue forms, i've got a few of them unused at home
there's rarely much if any queue and it can be faster - it depends heavily on if there was an arrival shortly before the VS one and where from, pax from some countries get a lot more scrutiny, then queues can back up and it's worth heading for fast track instead