First timer can sum1 give me advice plz

[Manc andy uk]

Im 3days into12/12 would it be ok to top 1 ov my plants or is it to late

[Shovelhandle]

I usually top early in veg, myself. Why do you want to crop them now? You could do it, I'm sure it would work out well. Don't wait any longer though. There are other ways to work with the plants depending on what you are trying to accomplish.