Should of been done before the flip. As it'll show up in tiny little standalone shoots. You'll know they won't give much. Generally you shouldn't lollipop in flowering but I get the odd bit of larf pops up in places you didn't expect it to where you didn't remove the growth in veg..
But do so now. As why would you wait any longer as the longer they are still up is the longer they are using up energy that could of went to sites above said node. I normally remove 1/3 of the bottom growth on the 1st 2 sets of nodes. And then as the sets go up. Anything that looks like it'll be blocked and hasn't got many shoots around the site or if it didn't veg long enough before flipping it its an auto, all that remove but before you flip.. as the energy that goes into flipping that larf is gone. And uses more the longer its there. So just get rid of.. Anything past the preflower point (10-15 days into flower), there really is no point removing as its spent the energy to make it, and its just about getting light to it now. And Anything you missed passed this point can go into making hash and so on, if you into that.