It is currently available in South Korea and the US. You may get it with a different beta version in your region.
The software version (US) of this update is G970USQU2ZSKL, G973USQU2ZSKL, and G975USQU2ZSKL for the Galaxy S10e, S10, and S10+ respectively. It comes with a small size – more than 200MB.
If you are in One UI 2.0 beta program you can download it by heading into the Settings > Software update.