Have they finished?

not all seeds are created equal. When doing a pheno hunt you will pop loads of seeds and pick the best from the bunch. So when ordering seeds from seed banks you are basically doing your own pheno hunt. Some seeds will finish quicker than others even though they from the same batch. It is more than likely that your flowers will be ready before the breeders flowering time. Do you have jewellers loop or a magnifying glass? Take a look at the trichomes and see if they are milky or amber or clear. This is the best way to determine when to flush your plants. Happy growing!