Galaxy S9 SM-G960U
Security Patch Level
July 1st, 2019
I also didn't receive the camera night mode option. I'm assuming that my carrier found some issues with the new version and pulled it. I expect it will install with a future update but who knows. There's always hope.
Sprint actually released it this morning. It must be why they took so long. Sorry you guys haven't received it. Besides getting later additional improvements seems though the S9 has been the forgotten phone when it comes to updating as of the last 6 months.