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Yeah you can, but do you intend on using it to train the plants as in scrog or to support the weight?
You can still use it for both, but it would had been more effective for scrog if you had intalled it earlier.
Hope it helped, and if it did feel free to chose my answer as "The Answer" it helps out a lot in GOTM contest.
Thanks.
If they just showed their sex, then yes, you still have over a week before the stretch. If they are actually in preflower and started stretching, then no. They will develop thin and long branches that won't support much bud. Hope this helps!