Although handsets on other carriers all over the world should receive it as well, it looks like the first Galaxy A71 5G units to receive the Android 11-based One UI 3.0 update are those on Sprint's network in the US. In addition to the software refresh, it also addresses a memory corruption exploit.
https://www.notebookcheck.net/Samsung-Galaxy-A71-5G-gets-Android-11-based-One-UI-3-0-update.519530.0.html