The Exynos variant of the Samsung Galaxy Note 8 had just begun receiving its official Android Pie based One UI update a few days ago, beginning with regions of Eastern Europe and India. The update measured at about 2GB, but that was expected as it brings along significant performance upgrades, as well as February 2019's security patches to the device. It also features One UI, Samsung's redesigned UI which replaces the earlier Samsung Experience UI. It brings more minimal icons, an Android Pie-like notifications shade, navigation gestures, a system-wide dark theme, and much more.
Samsung has now released the kernel source code for this Android Pie release for the Exynos based Galaxy Note 8. This will allow custom kernel developers update their kernels for the device for compatibility with the Android Pie update.
Forum Link: Android Pie Source Code for the Samsung Galaxy Note 8 (Exynos)