I follow Last Frontier Heli-Skiing on IG, they operate in that area and as of a week ago, they were sitting on 150cms so far. With that said, Stewart is a long fuggin drive with a highway that can turn into a complete ch!t show in a hurry from weather. Phenomenal scenery though if you get clear skies. Pack an inReach too, when I was there last, cell reception ended at the Kitwanga turnoff and there isn't anything fuel/food/lodging for a long ways.
Spring sledn there is awesome. We used to go up there for May long. Took the campers and parked up at the mine. Started going up there in 2000.Go to Stewart in the spring, easter time