It is pretty safe to say that your pedi will recommend starting to make the switch at your next appointment.
I cut out our morning bottle and our afternoon bottle of formula. He is still getting one formula bottle before nap (after lunch) and one right before bed. I just make sure to offer him plenty of WCM during the day in his sippy. He's taking it better than I thought. I just opened my last can so once that is gone we will be done. Also, DS won't take formula out of sippy and I don't plan on putting WCM into his bottles. Hopefully we will be done with the transition to full time WCM within the next few weeks!