how to see my Card reader on my macpro

Look under About This Mac>Overview>System Report>Hardware and then the method of connection which is likely USB.

The card reader should be listed.The listing will include a card when a card is inserted.

Unless a card is inserted the card reader/card will not show in Finder or Disk Utility.

Unless there's a card inserted the Mac can read , you won't see the actual reader hardware on the Mac except maybe in Apple Menu->About This Mac->System Report->USB (assuming its attached over USB)

With a readable card inserted, the card itself should appear in Finder (SD cards), and on the desktop. Or in whatever App uses the card if its not a storage type of card.

You can alternatively open Disk Utility, and the card will also appear there even if it cannot be mounted in Finder.

Does it appear in Disk Utility?

This is a 64GB SD card inserted into my USB-C Dock that has an SD slot for example.

What specific reader?

How is it connected to the Mac?