I’m on Plan S and have SIBO. How do I know the timing to add in or eat certain things in each of the Phases? Also, I am on the 4th day of the bone broth fast, but I’m unclear on how long I have to wait to start the supplements.

The thing about timing is that your own body will let you know when you can handle things. With SIBO, you have bacterial overgrowth in the small intestine. This could be various strains of good and bad bacteria that are overgrown, and each one of your bodies has a different concoction of overgrowth. You should start the supplements now while you are on your BBF and finish the pathogen purge supplements. After that, you can try to add new foods that previously "fed" the overgrowth one at a time - as your terrain changes and re-seeding happens, many new foods will open up to you.