Of course not the US models though... TWRP released for Snapdragon Galaxy S8/S8+, but not the US models
Since the US models have a locked bootloader including the US unlocked models, I don't really see much reason to root anyways. Locked bootloader means you can't install custom ROMs.
The US versions of the S7 also had a locked bootloader but the phone could still be rooted. They must have changed something on the S8 then.