My experience is that an update that shows in your Software Update section is fine to accept.
I buy my phones sim free Unlocked to any network and haven't experienced any issues.
If you download the PhoneInfo App from the PlayStore it will show you amongst many other things what your phone model is under the csc code section and what it's csc code is which shows what firmware is on it.
My s8 model is displayed in my signature box below.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "