Regarding interfacing with GPIO pins

Actually I have created a aes ecryption program and its bitstream and overlay is done from HLS and vivado.
What I want is gpio pin to give high when my above program runs and gpio pin to give low when program ends.
I have written in jupyter notebook the output gpio pin initialisation and high low code but when I try to measure it using an oscilloscope there is no deflection in oscilloscope.

Why the wire from GPIO pin 0 is not showing high low on probes from oscilloscope.

My final goal is to do power analysis of my aes implementation.
so before doing that I was trying to see if basic high and low is detected in oscilloscope.

I am using pynq -Z2.

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