Is it too late to start using fox farms nutes?

I'm about 5-6 weeks into flowering and finally received the trio from fox farms. Tiger, grow, and big bloom. Is it too late to start using them? I've been using some 10/10/10 till now at a really low dose.

If you're going to harvest on week 8 or 9, maybe give them one shot now and call it good.

Yea that's what I was leaning towards. One is indica dom the other. Is sativa, the sativa looks like she's gonna need more time though