I don’t think you have to wait at all for medication. Most people don’t unless there is a concern for suicidal ideation. The first step is educating him on OCD. Just because someone has OCD doesn’t mean they understand how it works or how they are growing it per se. I would start with NOCD. My courses can also act as a supplement. The OCD course for kids and teens will give him the skills directly. The OCD course for parents (you have free access to as a member) will teach you how to help him directly as well.