Sprint has released the June Android Security Update on their network for the Samsung Galaxy S8 and S8 Plus. The updates are 250MB in size and mostly consist of the security update but also have a few other minor performance improvements too. For the S8, you are looking for build G950USQU1AQFJ while the S8 Plus will be getting version G955USQU1AQFJ. The update is rollin g out now and should hit all devices over the course of the next week.
Along with the security updates, there are fixes for the Find My Mobile app as well as an LTE Roaming fix and a SMS fix for “(/5)OK”.