Howdy Joel and kwkeuter
To my knowledge, no one has hiked up Skyline to Long Valley since the tram closure. I suspect that folks have hiked up to the snow level (5 K?) or a bit beyond and back down. Putting aside the fact that one would have to hike back down after reaching Long Valley, there is presently no route to follow in the upper section from the traverse to Long Valley. The traverse to Coffman's may be a 35-45 degree snowy slope, requiring a left-handed self-arrest if necessary.
I am an average but experienced Skyline hiker (~6 hours in cool weather but without snow). I've used crampons and ice-axe from the traverse to Long Valley, which adds 1 to 2 hours.
If we seem overly concerned, here's a bit of history. In 2009, a group went up despite our warnings on this forum about conditions. When they reached the snow, their feet got cold and they couldn't find the route. Fortunately, SAR hoisted them out via helicopter near the beginning of the traverse. In 2017 (another big snow year), another group (9 people?) required a SAR hoist rescue above the traverse in spite of our warnings on this forum.
Miles of smiles,
Ellen