The latest updates for Skype for Business Server 2019 and how to update each server role is described here:
Here is the Cumulative Updates List for Skype for Business Server 2019.
|Version||Cumulative Update||KB Article|
|7.0.2046.123||July 2019 (CU1)||KB4499991|
|7.0.2046.116||June 2019 (HF1) (*)||KB4507638|
* Only the Front End Server was update on this release.
Note: This list will include the version for the Core Components. This is because not all components are updated when we apply a Cumulative Update.
We can use the same PowerShell cmdlets to check the component version:
The previous lists for OCS/Lync/Skype for Business Server can be found in the following links: