In Unix, there’s no command that we can use to monitor the printing queue on a defined Unix printer.

What we can do was to write a shell script that will loop in defined seconds to check for the printer status

Unix printer status checking command was lpstat and the command below will loop every 4 seconds to check on the printer status

while true
do
lpstat <printer name>
sleep 4
done;

The looping of this Unix command will check the Unix printer status, you may modified the command to output the result into a flat file too.