General rule of thumb is that you feed your chameleons after your crickets have been gut loaded. So if you feed your crickets in the morning, then give it a couple hours and they'll likely all have stopped by for food. This time would be appropriate to feed them to your chameleons. Crickets are constantly searching for food, thus meaning they generally eat what you put in front of them right away. I personally always have gutload available for my crickets to eat, so I am never really worried about my chameleons not getting a cricket that hasn't been gutloaded.
