Samsung ahs sent out a ton of One UI 2.0 beta updates to the Galaxy S10 phones, so it makes sense that the phone will be the first to get the stable Android 10 update. The complete, official update roadmap for Samsung's Android 10-based One UI 2.0 rollout is here.
https://www.notebookcheck.net/Update-Party-Official-Android-10-based-One-UI-2-0-update-roadmap-surfaces.444811.0.html