If you have the fox farm id say you can wait at least a few weeks. And with the top dressing, I'd recommend a couple tablespoons spread on top, possibly as the plant get further along you may want to change to 1/3 + cup of dressing and then eventually change to a bloom like top dress the 2-5-3. Id start the 2/5/3 just before your flip to 12/12. And just watch for any deficiences to increase the top dress.
I love the sustainable organic grows, good luck, happy growing. ✌️