MIUI 14 supported on my Redmi Note 9 Pro. I never thought it would since this phone is almost 3 years old now but apparently it does. Still Android 12 though. : r/Xiaomi
MIUI 14 on Redmi Note 9 and Redmi 9? Date clues - GizChina.it
Redmi Note 9 Pro (Joyeuse) : Receives update to MIUI 14 based on Android 12 (V14.0.3.0.SJZMIXM Global ROM) - News by Xiaomi Miui Hellas