Check With IT
If you use your Galaxy Note 9 for work it might be smart to check in with your IT team (if you have one) before you install Android Pie.
Enterprise problems always popup after major Android releases and we're already seeing complaints from Galaxy users who've installed Android Pie.
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.
Checking in with your IT department could provide you with essential feedback about Android Pie's compatibility with work 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.