Can I control an output while gcode is being processed?

I need to make an addition to a GUI I created using Python and QtDesigner.
Is it possible to control an output at the same time while a line of gcode is being processed?
For example,the machine started to move from (0,0,0) . The gcode in process (G0 X60 Y80, Z-5) is making a movement in x,y and z coordinates and the movement is 100mm.
I need to toggle one output for every 10mm progression.
How do I do that?

I would insert an M63 P.. before the move in question to set a digital output synchronized with the start of the movement. Then create a realtime component that starts to calculate the 3d distance when the digital output goes true and outputs a signal for every 10mm of travel.

I would be grateful if you could give me a little more detail. I saw that synchronized movements can be made with M63 in the manual, but I could not find details.

See here:
linuxcnc.org/docs/html/gcode/m-code.html#mcode:m62-m65