If a worker is expected to make 10 pieces of an item per hour its easy for managers to verify this. For a knowledge or creative worker it's similarly easy to verify expected performance.
This is not new, workers have been measured for performance everywhere since manufacturing and corporate jobs began.
If we ignore that for a moment, the point you are making applies to management too, yet this tech is guaranteed to not be used for management where things and outcomes are left 'more fuzzy'. Why?
How about we apply it to governance with complete transparency to the electorate. Nope, not going to happen. Because its exploitative and intrusive and will only be applied to the powerless lowest who have no choice.