Q.Are My Potatoes Ready To Harvest?
I planted my potato seeds about three months ago. The plant has been huge and healthy, but lately the shoots underneath started yellowing and have died off. The younger shoots, however, are still green and vibrant (with a little yellowing on some). I’ve read once they’re ready you should stop watering them for two weeks. It’s time to water them, but I don’t know if I should water or not? We are in a heat wave, so if I should still be watering I need to do it soon. Please give me some advice.

Certified GKH Gardening Expert
I would let them go until the weather no longer permits, or gets too cold. The plant will die when it is time to harvest, usually. This is when cold weather starts.
Here is an article that will help you to know how and when to harvest them:
https://www.gardeningknowhow.com/edible/vegetables/potato/how-and-when-to-harvest-potatoes.htm