Your tall skinny plants look exactly like a few master kush plants Im finally smoking after lots of dry/cure time.

Mine got 6 foot 4 inches, I flowered it after 1 1/2 months from seed and they were only 2 feet tall when I started flower. 5-6 oz super chrons each

Id clone a good amount off the tops so it doesnt fill up your spot before its done, and youll have nice rooted and vegged clones by the time you replace with the finished ones