A series of official Samsung Android 10 rollout roadmaps all cite the Galaxy S10 phones as billed to receive the stable Android 10 update in January. That isn't the case for all regions, though, as some owners of the S10, S10+, and S10e are already confirming receipt of the OTA.
https://www.notebookcheck.net/The-Samsung-Galaxy-S10-S10-and-S10e-are-now-receiving-the-stable-Android-10-based-One-UI-2-0-update.445011.0.html