Coming along great, my yatsubusa root cuttings are at the same stage as yours on the first post... I think one of them could be working into something similar.
Temps will be cooling a bit here over the next few days, with less intense sun. I use the weather forecast at times when making these types of decisions
Also here in Britain this week Ive just separated a Cork bark elm ,Mountain maple and Potentilla air layers which seem to be all happily establishing with no signs of wilting. All had strong new rooting so our current cooler weather after our recent heatwave is helping them to establish after separating from their mother plants .