Hi patjbourg,
In order to scan wireless from your Mac, you need to download the Scanner Driver & Utilities V2.9.0 for Mac OS : Scanner Driver & Utilities V2.10.0 for Mac OS : 10.7/10.8/10.9/10.10/10.11/10.12/10.13 file. Click HERE to access the download page. It will install the ScanGear driver. It will also install the MF Scan Utility scanning app.
To initially set up the network scanner on your Mac, follow this guide:
1. Open Applications, then select the Canon MF utility folder and choose to open MF Scan Utility (If no scanner found error appears, ignore it).
2. At the top left hand corner of your screen, next to the apple icon you'll see MF utility. Click on it and select network scanner setting from the drop down menu. Click on the plus sign (+) and select the your Canon model from the list, then click Add.
3. At the top of the screen, to the right of MF Scan Utility, click Scanner and select your Canon model from the drop down menu.
4. Attempt a scan.