I know/feel that harvesting Herbs , Basil , Thyme ,Rosemary , etc. When the plant is rested. The leaves are not wilted and full of aroma. I would think it would be the same with most crops but can't say for sure. Leaves could wilt from fruited plants in the evening , the plant is tired . But would that effect the "Taste" of a fruit like a pepper ????
Harvest early in the morning and don't worry about it any longer .
Peace,
P. Dreadie