Browser Print issues on mac safari

I'm trying to print a label to printer Zebra GK420t from browser. The printer is connected to system via USB port.

The printer has been installed on mac by following the procedure https://www.zebra.com/ap/en/products/software/barcode-printers/link-os/browser-print.html

 

I created an html page that uses BrowserPrint-1.0.4.min.js downloaded from Zebra's website to print label using ZPL commands.

If I print from a Windows PC, the label is printed correctly.

If I print from a Mac, checkPrinterStatus not returning any printer status.

 

Anybody have any tips/solutions to this mac issue?