They could already monitor computer screens either with security cameras or some software, if you work in office, yet at least where I am from they do not do it. Even though it is possible. They even do not monitor the time you log in or log off, at least for white collar work I do. Of course, it is different in manufacturing and warehouses etc. where people are treated as slaves... It has always sadly been so that white collar workers (especially not in entry level jobs) can slack off more than people who actually do hard physical work. I know part of that is that they think the more free we are, the better our brains will work and come up with million dollar ideas, but still...