You don't really need molasses to flush, just some pure water would be suffice. You can use molasses all the way through growth but it won't mess up your flush even if you did use some now, just not really effective. Look for the mostly milky looking trichs for an early heady buzz. Judging by your pics your pretty close to that point. You'll know when the trichs turn amber because the bud looks like it has a golden aura. You def don't need to wait that long but you'll learn when a good time to pick after you do it a few times. You'll just develop that feeling that it's time to pluck, like a Weed Jedi.