I am not totally sure what you mean by total shutter click count, but maybe the links above might help. I don’t know if the programs on there have changed or how accurate the info in the links are, but maybe this will be a place to start for you.
Each camera has a life of total number of times it can be used. It’s usually in the realm of a couple of hundred thousand pictures. It’s important to k ow if you’re buying a used camera.