As it happened so far, the next-gen Galaxy flagship will come with both Snapdragon and Exynos processors onboard, depending on the market. The Geekbench 4.0 test results for the Snapdragon 845-powered variant have just surfaced online and it looks like there is still room for optimizations until the handset's launch.
https://www.notebookcheck.net/Samsung-Galaxy-S9-with-Snapdragon-845-onboard-hits-Geekbench.281954.0.html