How odd that you claim: "I often find Cortana high on priority and resources, is it spying on me?"
And show a picture where Cortana is paused and uses 0 (ZERO)% of: CPU, Memory, disk and Network...
In my world 0% is nothing... But that is only my opinion..
If you only run Windows 10 at weekends its natural that windows tries to find updates etc.
And you should not disable Windows update if you use the crappy Defender as it downloads it´s updates via Windows update..