There is evidently some type of dashboard your manager has access to or is going to have access to shortly. It is going to show a log of when you badge in and determine how long you are on campus based on how long you are connected to the wifi. If you first badge in too late during the day (e.g. 11 am when you should be in by 9), it'll just count as you missing the day.
This is going to be used to track those not complying with the RTO policy and used as an excuse to fire you for cause, e.g. no severance.
If your manager says that they aren't going to micromanage you, and you dont need to be on site all the time/all day every day, you should get that in writing for legal protection. Do not open yourself up to giving intel a free reason to fire you.