The Galaxy S8 and S8+ haven’t been in the hands of consumers for long, but as with almost any Android phone, developers are eager to flash custom recoveries and ROMs onto it. As such, it should come as little surprise that TWRP is already available for the Exynos Galaxy S8 and S8+.
The S8 and S8+ use dm-verity, which means that swiping to allow system modifications at startup will prevent the stock ROM from booting (unless you are using a custom kernel).
TWRP is now available for the Exynos Galaxy S8 and S8+ was written by the awesome team at Android Police.