Check in With IT
If you use your Galaxy S9 or Galaxy S9+ for work it might be smart to check in with your IT team (if you have one) before you install the update.
Enterprise problems are common after major Android releases and we're seeing complaints after the Android Pie release.
Checking in with your IT department could provide you with essential feedback about Samsung's update. If there aren't any clear guidelines at your place of employment, make sure you check in with IT before you install the new software.
If you don't have an IT department it might be a good idea to check in with your co-workers who're using Android Pie and get their feedback before making a move.