When to know when to update your life cycle channels

When do you know there are updates available so you can update your life cycles from the vendor channels that are being sync’ daily from the SCC. It is not addressed specifically. I thought I would see a number in the build button in CLM but I think I must have received updates by now ( I created the channels a few weeks ago) and its still showing build (0). I see this text " Version 2: (draft - not built) - Check the changes below". What changes? Nothing is ever listed.