We did the Rhino tour last week. I booked online, for Valentine's Day on the first day that they re-opened reservations for the tours.
We definitely enjoyed the tour. No photos are permitted backstage, so you won't see pictures unless they were taken by Disney to promote the tour. You remain outside of the actual barn. They will walk you around the side of the barn to a paddock on the end. And if one of the adult Rhinos is willing, you will get to watch a voluntary training session and get to touch/pet an adult white rhino. Which specific rhinos you see and which adult you might get to touch depends on the day.
They rotate Dugan (the male) and one female on/off the savannah. So some days Dugan is backstage and other days the females with babies ('Ranger' & 'Mylo') are backstage. Currently Lola and baby 'Logan' (the youngest) are in the barns, but not close to where you will be standing (although we did get a distant glimpse of them during our tour). If you want to see Logan, you'll get a better view from the Train that goes past the back side of the barn on the way to Rafiki's Planet Watch.
Baby 'Mylo' rotates out onto the Kilimanjaro Safari savannah, and we actually had a nice, up close viewing of him with his mom and the other rhinos near the mud wallow today. Photos attached.