The first step is being realistic. You can’t lock down the internet. You can’t keep them from using devices you don’t control. You cannot dictate their lives.
The thing to do is talk with them about your worries. To tell them your concerns and seek their help in mitigation.
Open communication and trust are the only long term solutions. Not technology. There is no silver bullet.
It’s not a matter of key performance indicators. Screen time is integral to many lives today.
It would be great to get all the TPS reports you want. It won’t replace having a close relationship with your child. Developing trust. Providing safe room for mistakes. Good luck.