2nd Annual Outdoor Grow. 3 auto's and 3 photo's

Let the plant recycle what is there already, it does not go to waste then. As 0011 said, if you give them a slight tug and they fall off, then that is the time. Cutting them off just because they look less than perfect is pointless, they won't harm anything, but your plant will get benefits from the leaves being left on until the very end.

it's not going to be a huge difference, but better to let the plant suck it down. if it falls off with a touch, it's time. At the scale of a home garden, i doubt it is even a noticeable difference either way you choose.

You’re outside. Any deficient leaves are a breeding ground for pests and disease. The heat makes you more vulnerable. Get rid of the lowers that don’t receive direct sun that are damaged. Monitor for pests and disease. Best of luck in your grow.