Today Sprint has started rolling out the update to Android 9 Pie to Samsung Galaxy Note9 units it has sold. The move comes a few short days after AT&T released the same new software for Samsung's flagship phablet, and at the moment these are the only US carriers updating their Note9 units to Android Pie.
In Sprint's case, the update arrives over-the-air as a 1.8GB download. After you install it, you'll be on build N960USQU1CSAA. It includes the January 2019 security patches alongside everything that Google's packed into Android Pie last year, and Samsung's own One UI on top.
The new interface, which replaces Samsung Experience, which itself replaced TouchWiz a few years ago, is making its debut in the updates to Android 9 Pie for the Galaxy S9, S9+, and Note9. It's also expected to feature in the upcoming Galaxy S10, S10+, and S10E. Sprint sent out the update to Android Pie with One UI to its S9 and S9+ units last week.
Friendly Advice, Next time put comments on a page related to One Plus content only.
Have you tried downloading Android Pie with One UI manually? Settings> Software Update> Dowload updates manually. I was has happy with Oreo & yet to find any advantages with Pie.