Via 9to5Google:

Ahead of schedule, Samsung is now rolling out Android 10 in the United States. Some US carriers including T-Mobile and Sprint appear to be rolling out Android 10 to the Samsung Galaxy S10 for users.

This is about a month quicker than they did with Android Pie, which started rolling out in the US in early-to-mid January. Good on you, Samsung. It's still slower than many manufacturers, and it's maddeningly long for those of us who like to get updates when they're released, but at least it's progress.