How do I get my Cannon printer back online on my Mac?
Re-add your printer from the print queue to resolve the Cannon printer offline Mac issue. Hit the icon of Spotlight and open Printers & Scanners. Tap the name of your Cannon printer and choose the Remove Printer option. Now, tap Remove Printer when the prompt appears. After that, tap Add Printer, Scanner, or Fax. Choose your Cannon printer followed by tapping the Add option. You can also restart the printer to fix the offline error.

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How To Get Canon Printer Online On Mac? - Canon Support

The main reason for not printing any document is that your Canon Printer may get offline. So, to make your Canon Printer Online On Mac.