the pop-up window will pop up automatically

Hello~ Can you help me say this naturally please?

A: Hey, how will I know
ⓐif the ink is running out or not?
ⓑif the ink is out of or not?

B: When the ink is almost running out the pop-up window will pop up automatically and will tell you if your printer is out of ink.

How about:
When the ink is almost finished the pop-up window will open automatically and will tell you that your printer is out of ink.