Planting tomatoes from rock wool to dutchbucket can be done as soon as you see a couple roots growing out from the rockwool cube if growing indoors otherwise if outside I. Full sun roots should be 2-3 inches long.
Are you planning to grow these tomatoes indoors or out? If outdoors in full sun your plants will die fast if you only
pump nutrient water 3 times a day. At night you can get away with 3 times not during the day.