Samsung is now sending out the stable Pie update to its Verizon and Unlocked models in the US. Unlocked Samsung models are usually the last to receive updates, so this means that all Note 9 users in the US have now received the Pie-based One UI update.
https://www.notebookcheck.net/Unlocked-and-Verizon-Samsung-Galaxy-Note-9-models-are-now-receiving-the-stable-Pie-based-One-UI-update.413947.0.html