How late is too late to top?

I have had my plants in 12/12 for about 2-3 weeks and i'm starting to weed out the males
but my question is pretty much the title
Thanks

I've always heard that you don't want to top, chop, or do anything to the girls when they've started to flower. You will diminish your yield and temporarily stress the plant. You want as little stress in this period as possible because you want her to focus on budding, not healing.

If you have a height problem I'd suggest tying them back or something less drastic. However, some people do take off everything but the main colas a few weeks into flower so most of the budding is concentrated to a few sites.

Ideally you want to top your plants about 1-2 weeks before they go into flower. Doing this during flower is going to set the plants back, stress them out, and hurt your yield.

yes it is too late to top. If you do now then you will greatly lower your yield. you will still be surprised at how much weed you will get out of the main cola.