https://wccftech.com/android-10-for-galaxy-s10-to-start-rolling-out-in-january-according-to-samsungs-roadmap/

Shortly after a major Android version is out, OEMs release their update roadmap. It is a list of devices eligible to receive the update along with an approximate timeline. The list is slightly different for different regions, but it gives us a good idea about global trends. Samsung posted its Android 10 roadmap today, and it looks like most users are going to have to wait until January for the update.

Germany and Korea could get the software as early as this month. Participants of the One UI 2.0 beta program in Germany have already received a stable version of Android 10, so it shouldn't be long before users on Android Pie receive one. The same goes for Korea, Samsung's home country.