Is my device still connected to previous owner’s Apple ID or not?

I bought a used 13 pro, and during purchase it was unlocked and in the settings it was saying “Continue setting up your device” or smth like that. And I forgot to ask the seller if they turned off Find My from previous user, and bought it. I continued all the setting the iphone at home, I connected Apple ID and iCloud, AppStore, iTunes without a problem. Also turned ON the Find My using my Apple ID. I checked my iCloud if this device is visible there - YES. So, the question is:

Can this iPhone in fact still be visible on previous owner’s iCloud? Can they Lock my device anytime? Or is there a possibility that my iPhone will be locked once I decide to update iOS to new version?

Thank you in advance