I was recently looking for support cycles for Android phones but failed to find anything concrete. Can you point me to where Samsung have documented their support cycle?
"... And select devices launched in 2019 or later will be supported with firmware security updates for a minimum of four (4) years following their global launch, while select newer devices will receive up to five (5) years of security updates."
It's a good start I'd say, considering that Samsung is a major player in the android phone space.