Coconut Battery has a near-real-time "Charging with" measurement, which I've found to work well. There have been no anomalies with AlDente after I knew not to try the auto-discharge feature in clamshell mode.I had a bit of trouble getting my mind round what Allow Discharge actually does, so did some tests using a Satechi USB-C in line power meter to observe what was going int the machine.
Also glad to report that after 39 cycles and 3 months the Air is still holding steady at 100% battery health. It went down to 98% at some point, but with AlDente and better charging habits, it consistently returns to a few mAh above the Design Capacity.