Best practise USB tapping / sniffing?

Dear forum.

I have entered CCTV-project where the data/text sent from a Windows-based cash register to the cash register customer display shall be presented on the separate CCTV server. The cash register display is USB-based.

I will be very happy for any help for finding best practise in tapping/sniffing this data to copy it to the CCTV server. The best solution would be if no software is required on the cash register, but this might not be possible(?)

Looking forward for your responses!