So I did a quick and dirty "when amperage goes over 2 amps and then falls below 2 amps for more than 10 minutes send me a notification" and it's pretty idiot proof.
Idk if you need estimated time to complete, but you can get pretty far with a very light weight automation.
If I were to improve it, I would time the cycle for the wash and add a helper so that I don't get 'washer is done" when I paused it for a shower or something, but that could be a rabbit hole.

