Since we don't have enough doses or dosing capacity yet to make anywhere reach herd immunity, not even tiny Israel (although hopefully they are getting close),

Since we don't have enough doses or dosing capacity yet to make anywhere reach herd immunity, not even tiny Israel (although hopefully they are getting close), it's not like shipping everything to South Africa would change anything. Also, given the refrigeration requirements of the early vaccines, shipping it to lower income countries would probably just increase the chance of some of the doses spoiling. Really, it's in virtually every country, so there's not a place on Earth where it's not mutating.