Samsung usually doesn't advertise the exact dates and the dates that are public are usually rumours. That said, if they decide to defy their internal roadmap it is usually for a good reason. Nobody wants to have a broken phone 
Yes. that's true, there's a notification in the Samsung Members App :
@BoostSimon wrote:Is it true that the One Ui 2.0 update has been postponed until march for the S9?
Interesting, because it still says January on my members app, but SamMobile posted this saying Feb
https://www.sammobile.com/news/samsung-galaxy-s9-now-set-to-get-android-10-update-in-february/
