With the right feed and carry on what your doing,if they keep that shape min 8 per plant ,but impossible to say.
Nice job though dude lovely round plants great to see,it's how I grow.if you took one out I. Future and vegged longer ,bigger plants you be looking at a large amount of nice cured bud.sometimes less is more dude,I would also get a other 600 in time .1 plant per light .but big ass plants grown scrog style with multiple topping during veg,
Just veg along side the flowering plants take the clones the day you flip the other set to 12/12 off save you a fortune if you veg under a decent sized t5 too ,all my vegging is done under a t5 ,with the 2 hps lights just used in flowering.
By taking the cuttings at the start of flowering or starting seeds ,then they will be the perfect size to flower once the flowering crop is done,and so on allows you to do more crops per year too .
Peace tyke