Is molasses all you use, or just added to other ferts? If just molasses, then I'd say go ahead and give it. For other ferts, I'd say, take a look at the plants. If they look good and like they don't need anything, you might withhold another feeding. If they're in soil, there's a good chance that the soil has enough already to hold them until the end. Just don't water too much and dilute what's there. Without seeing the plants, that is my suggestion. It will guarantee very little ferts in the plants come harvest time.