Samsung is rolling out a new software update for the international version of the Galaxy S8 series. The latest software update includes the November 2018 security patch, bug fixes, and minor improvements.
The software version of this update is G950FXXU4CRK1 and G955FXXU4CRK1 (In some countries G950FXXS4CRJD/G955FXXS4CRJD) for the Galaxy S8 and S8+. The size of this update is 406.40MB.
Are you still waiting for the update, you can check for it manually by heading into Settings > Software Updates.