How to Log Users Connecting to a Wifi Router?

So my question is, Is it possible to set up some kind of software that listens and logs mobile devices and or laptops that comes in range of a WIFI network ?

What i essentially want the program to do is to save when the mac address came in range with the router and when it went out of range again

for instance being able to see when an employee arrives and than again leaves work. They however do not have access to the WIFI and the router is mac filtered but as far as i understand, almost every devices does communicate with the network from time to time.

Thanks in advance to anyone that would be able to assist.

I am still pretty new to the programming world and any assistance on this topic would be greatly appreciated.