Yellow leaves in white widow auto

Second grow waaay more successful than the first as far as size. Our first grow had some success with buds but had very limited potency. This grow:

White widow auto
Sprouted 11/16/19
Nectar of the gods nutes, ended 3 weeks ago because we thought they were getting close but we might have been way off. We didn’t want to start back up with the nutes after we quit.
Flowering started 12/25

Just wondering if we did something wrong, if they look like they are close to harvest, and if the yellow leaves are ok???!! Thanks for any and all advice.