Here is some reason that you can check if you are worried about “My printer is offline”:

• Check both the system and printer are connected to the same Wi-Fi network.
• Make sure that the printer is set as a default printer on your computer.
• Furthermore, You can restart your system by switching it off for 30 seconds and then restart it and check whether it is working or not.
• Clear the queue and make sure there is no pending task.
• Reconnect your printer again.
• At last, after proceeding with all the above-mentioned steps, restart your computer.
https://www.myprinterisoffline.com/