Electrical – Which Pin is NC, NO, COM in this relay module

Yes, you are right.

Anyway if you have doubts:

• connect ohmmeter/continuity tester between 1 and 4 - if it shows zero resistance then this is the NC pin
• do the same for pin 1 and 3. You should get open circuit.
• between any coil pin and switch you should get open circuit.

I always do that, because I get confused with datasheets - top/bottom view.

Apply voltage to pin 2 and 5. Do the same test again. It should show opposite results.

If I see it correctly you have a JQC-3FC/T73.

You can see the pinout here. Use this pinout to know which contact of the relay's the NC NO and Coil. Now follow the lines where it's headed to and what connector the NC NO and Coil are.