I went over NAP on 6/24 and 6/28 on my way to/from Whitney. I wore trail runners and was fine, but YMMV. On my way out, the trail was still covered with snow at the very top, plus a cornice.
On the way up, meaning toward Langley, what I and others were doing to avoid that top section was to traverse right, just before the trail runs out. There are some small cairns and definitely footprints. Keep going to the right, then there will be sharp left where you can easily hike up a crack, up between the rocks and top out. You end up to the right of the trail/sign, but head back left and it is that way. Headed back out to Cottonwood Lakes, go left at NAP sign along the ridge, there will be a few small cairns indicating where to head down.
I don't know what the conditions are on Langley, as I did not go there, but headed down to the Rock Creek Trail.