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For "I'm done" notification, I use relay with power metering - looking at the power pattern, home assistant can be set up for notification after x time when that graph drops to floor.

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Exactly, that's also my setup. Works as a charm! The power meter is a zwave switch which sits between the socket and the washing machine.

Same here. I’m sitting here reading stuff about reporting time remaining and wondering why that matters? Isn’t the concern just when its done?

I got one of these: https://www.amazon.com/dp/B08LN3C7WK . Connected it to my HomeBridge server (all local), set up a push notification using when the energy drops below 5 watts (which happens about 1-2 minutes after the cycle ends).

I setup a power monitor that resets a 5 min timer every time the power usage goes over X. It would still be nice to have an idea of how much time is left - I've considered setting up a pi-camera to OCR the display.

Shelly has a few relays with power metering and they offer lots of local-first and open ways of communicating. I use one to control power to my 3d printer.

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