In New York State can my boss legally record and listen in on the audio picked up by the cameras in his business?

Unless I agreed to it when I signed the onboarding paperwork isn't it illegal to monitor or record audio of employees? He will access the camera and audio feed on his phone and “bust” people in real time sometimes just based on the topic we're talking about. Nothing insanely vulgar or inappropriate, his wife is a catholic and doesn't like certain subjects basically. Is this legal?