Nope, this is on the loading end, after you've waited in line right before getting into the cars (step #5 below).
And, just so I can jump on-board the explanation bandwagon for others who aren't familar with how the Disney wait-time system works, here it is spelled-out in steps:

1) System informs CM at line entrance that it's time to take a reading.
2) The CM scans the card at the line entrance and the system records its ID#.
3) You wait in line with the card.
4) At the load station, you hand the card to the CM.
5) The load station CM scans the card and the system records its ID#.
6) The system determines the time elapsed between step #2 and #5.
7) The time from #6 is displayed on the "Wait Time" signs out front.
I suppose I should have posted step-by-step details like this in my section of the forums just to have something new in there

Mike