Wait for the OTA If You Feel Uncomfortable
The Galaxy S9 Android 10 roll out is moving slowly and it'll take weeks to hit every model. If you don't want to wait for your update you can manually install the software right now if you have the right device, some patience, and some time.
Now that the official Galaxy S9 Android 10 firmware is available, select Galaxy S9 users can skip the OTA (Over-the-Air) roll out and install the operating system right now.
If you're feeling impatient you might be tempted to install the software right now. However, if you feel uncomfortable with any part of the manual installation process you should wait for your OTA to arrive.
Manually installing Android software upgrades can cause problems so make sure you feel confident before you begin.
Most Galaxy S9 Android 10 updates should roll out in the first half of 2020 so there's no need to force it.