Congratulations!! That's such a good feeling, no? Your plants look great.
You probably do have another foot of growth at least, maybe two. I started 12/12 at 4 weeks and 15-17"; they topped out around 50" and one is still putting height on the cola.
It's hard to guess at your strain without seeing the whole plant and I would personally be a poor judge anyway. If you're growing from bagseed, about the best you can do is guess at your level of sativa vs indica dominance. From your pic's, it looks to me like you have a strong sativa streak in your plants (say, 50%). Your final amount of stretch gives you a guess, too -- about 1.5 to 2X for indica-dom's; 3-4X for sativa doms.