While looking through the SCOM 2019 UR6 stuff, I did also find the other post for System Center 2019 products.
Update Rollup 6 for System Center 2019 – Microsoft Support
As you will see, there are UR6 updates right now for SC2019 versions of: SCOM, SCORCH, SCVMM, SCDPM.
For SCOM 2019 UR6, I wrote a separate blog post here: SCOM 2019 UR6 is available | TopQore Blog
Keep in mind again that System Center 2019 is going from mainstream support into extended support early April 2024, which is about 3 weeks from when I am writing this.
Enjoy!