Some sativa dominant strains can take a very long time to finish, don't be surprised if the power skunk isnt done in three weeks.
Am I to understand that you're going to try to take clones off of these ladies now? You might not be able to get them to root this late in the game, when you take clones from them any later than 2 weeks into 12/12 they have to revert to a vegatative state before they can start working on roots, you'll be lucky to clone these two. What you need to do, if you have a seperate veg area, is take the clones when you put the plants in flower, or within the first two weeks.
Anyway, best of luck to you. Keep us posted on that PS, I'd like to know how long they take to finish.