When to FIM?

I am looking to FIM my plants to possibly get 4 chutes. My question is, am I at that stage, or am I too late? I have read you want to do it on the 5th node, but I feel like my clones just recently rooted are still too young. I have attached the image so hopefully someone can shed some light on how I can proceed. Thanks for you help in advance.

Looks like u cam start topping or fimming, as long as u feel they are healthy to recover she looks good to me.
i just topped my clones at 3rd node way smaller than urs dude

You are fine to FIM now. The reason for earlier FIMing or topping is to end up with a shorter plant. You will just be 6 inches or so taller than the earlier FIMers. BigSteve.