Kilted Ginger

The right time is when you feel it is the right time, it will only work if you are ready for it too work.
Whether its after 3 months or 30 years riding doesn't matter.
It needs t be something you want to do and do for the right reasons, do it to realistically view and scrutinise your riding, do it to polish your good bits and improve your poor bits (we all have them) dont do it for a badge or status, it wont work.
Unfortunately there are some trainers / observers (iam, rospa and private) for whom its all about status, however in my experience most are only there to help and assist as best they can.
If its something you want to do then its the right time for you. Go along and talk to them all, get a feel for which one suits you best and once started if you dont feel you're getting what you expected dont be afraid to tell them.
Safe riding mate.