not yet, maybe a week from now. top either the 5th or 6th node. let it grow where yu can leave around a half inch of stem to make sure it strong and that yu actually top not fim. if yu cut it to close to the node below it may split later when yu doing lst or scrog .
Top your plants after they've developed between 3–5 nodes, as this is when their roots and stems are strong enough to recover from the stress of the process.