Samsung has outlined which devices it plans to upgrade to One UI 4 and Android 12 in India. The upgrade plan runs from November 2021 to August 2022 and includes 45 devices. Only the Galaxy S21, Galaxy S21+, Galaxy S21 Ultra, Z Flip3 and Galaxy Z Fold3 will see the OS upgrade before the start of 2022, though.
https://www.notebookcheck.net/Samsung-confirms-One-UI-4-upgrades-for-45-devices-in-India.579960.0.html