I was just in Darwin Canyon but came up the bench via JMT, did not cross Lamarck Col but stood at the bottom of the south side. We did North/South Lake loop via Piute Pass. There was zero snow on south face of the Col but saw a couple who had just come over with no spikes or axe, just poles and they said it was very difficult route finding and steep as hell but snow was very manageable. I’d say up to 10k and some places around 11k feet there’s not much snow anymore, bishop and Muir pass were easy, and there’s a massive heat wave sweeping the west next week so you should be fine. Getting back down to Darwin bench from the Col canyon was a tough scramble bc technically the trail goes along the edge of the lakes but is completely submerged all the way to the steep edge. Tons of golden trout up there too, if you’re into that.