i grew from seed and did no pruning scrog or anything just let it grow, and it seems as if the lower colas are ready to harvest while the main cola (the one all the other colas branch off) could still use some more flowering that being said my question is can i cut off all the secondary colas and leave the main cola to flower for a little longer or will it kill the plant
You can cut those off anytime you like, at this point the plant is basically dying already, putting all of its energy into growing buds. I usually cut off one or two branches a week early so I have something to smoke while i trim.