Samsung doesn’t recommend rooting/reflash the phone as it voids the warranty and the process is risky. Rooting bricks the phone and render it permanently inoperable.
Any information relating to the Official Android 9.0 can be updated in our official newsroom. Please refer the web-link timely to stay updated.
(Newsroom)Link:
https://news.samsung.com/us/
If you wish to chat, email or call us for any questions, please go to the "Contact Us" option available on the right hand side of the support page.
Thank you for choosing Samsung products.
Sincerely,
Veda