Looking at your plant your in bud....so it wont get to much bigger.... just the bud itself..... your going to have a nice top cola by the looks:thumbsup:

when you pop the rootball out of the potter.... you will be able to tell if you need to transplant....the roots will be going up the sides and the bottom is roots too.

After you are in bud the roots dont expand anymore....during your change over period the roots are still expanding