So you've got it covered. Use IFTTT with sense for the dryer and use @Ryan780 method for the washer. I'm using Aeon gen 1 HEM clamps with a driver originally written by @mike.maxwell and modified for HE by @ogiewon. It works outstanding for the dryer, but the start stop for the washer means it's just OK, not perfect. The delays I have setup help, but it sometimes notifies me the washer is finished when it's not even running. That's why I need to supplement with a vibration sensor.
Ryan's idea to use the light is a really good one. Unfortunately for me, mine just displays 0 min remaining. No "finished" light. Hmmm, has me wondering about maybe triggering from the voltage to the run LED though. 
