I need to get more serious about my washing machine cycle notifications. I have an ultrasonic water flow sensor on my water main and a whole-house power meter,

I need to get more serious about my washing machine cycle notifications. I have an ultrasonic water flow sensor on my water main and a whole-house power meter, but need to put a power meter on the washer/drier circuits directly to really sense them going off. For now, I just have a button I press when I start a load and it starts a complex timer that waits an hour and then starts giving voice notifications through the whole house (mimic3 TTS + snapcast) saying "The Laundry has been finished for 1.5 hours", etc every 30 mins until I clear it. Home Assistant is truly awesome though, gotta say.