What do I need to prove? That I produced x widgets in y hours? How about my team meets their goals and KPIs YoY consistently. How about there's work on the board, and theres 2 weeks to get it done, and we get it done. What more surveillance do you need? If theres dead weight on the team, it will be brought to light one way or another, through manager 1 on 1's, peer feedback, check ins, personal goals, etc.