depends, if it goes sativa side, it could be 8-10 more weeks or even longer (i have one of 'those phenos' at this very moment, lol).
i agree with this, i'd have repotted, and put them under 24 until they begin to blow. then switch, they'd likely be twice the size they are, it makes that much of a difference.
hope you get your pound, and don't worry about not being capable of it. the sativa dom i mentioned above is untested, but appears to be a three plus pounder after a couple more months in (currently week five in flower). that one plant is taking ALL of a wide-spread oversized raptor 8'' hood, 1kw hps and half of a 5x10 tent all by it's lonesome. the other light and half of the tent have two indica doms of the same age, that will probably be 2.5ish lbs.
shoot me a pm if i forget to load a pic in a few hours, 3 hours til sunrise here atm of posting...