It all depends on how big you like your plant as you could top at the 3rd node. I’m waiting for my 4th node, I’m currently doing an auto.
But ever growers different as some do it on 5th or 6th node etc.
Girls are growing vigor, i think its agood time to top them ... just above the 3rd node is recommended.
So wait 1 to 2 days longer, until you can top better and then you can do it