Size has nothing to do with it. If auto it is time yes but not size. If it is a reg plant it will be light cycle dependant.If they are on a flowering light schedule, then yes, if they are not large enough now they will grow until mature enough to flower which should be soon. However the one on the left may start immediately.
They are not on 12/12 yet i was going to wait until they atlest got tall enough i was thinking atleast 12 inches