lol no you don't have to wait to attach pics.
After you FIM, pinch, or prune in any way, it is best to wait at least 2, but ideally 3, weeks before initiating the flower cycle. You're right about waiting to see new growth.
Not every single plant of every single strain will even show alternating nodes (most but not all do). The 3 weeks after pinching that you are going to allow should be plenty of time to let the plant finish maturing.