Those pups look big enough to graft to a torch cactus or other grafting cactus or succulent, too big for Pereskiopsis. I would practice grafting with cactus seedlings on Pereskiopsis first until you get the hang of it before trying to graft those pups. It would suck to lose any of them! You can also plant them into their own pots if you want, you might get more pups that pop up after you do that. Very nice gift!
With the right light, temp and watering schedule you shoud see hairs growing from each of those white dots and the mother should flower and produce seeds once or twice a year.
Looking good! You might wanna point a fan directly at your bag for high fae. If it doesn't fruit you can also cut the bag at the sub level, case it and put it in the GH. Hoping to see some pan fruits soon!