30M years ago primates made it from Africa to South America [1]. The article also links an example of the floating vegetation that could have caused it [2]. So

30M years ago primates made it from Africa to South America [1]. The article also links an example of the floating vegetation that could have caused it [2]. So it seems very possible that some primates could have made it to Antarctica in the past 57-90M years of primate evolution. [1] https://www.smithsonianmag.com/science-nature/monkeys-raft-across-atlantic-twice-180974637/ https://www.smithsonianmag.com/science-nature/monkeys-raft-a... [2] https://www.youtube.com/watch?v=_OwfGunvPXA&t=27s https://www.youtube.com/watch?v=_OwfGunvPXA&t=27s