Definitely wait a while then. I wait until I have 6 or 7 nodes then cut above the 4th one. If you don't want to save the top as a clone you can just stick it in a glass of water under a cfl to get it to show sex. A week to 10 days is usually long enough for flowers to pop out. Sometimes they'll even root in the water.
I can be a bitch with some squat bushy strains when the nodes are basically stacked one on top of the other.