All managers should, in part, be coaches.
This is from the Picking up the Bill article on The Economist (May 25th 2019). Gallup, a polling organization cites research showing that when managers involved employees in setting their own work goals, the latter are four times more likely to report feeling engaged. Managers are responsible for 70% of the variance in how engaged employees were. (The Economist)
The same article talks about the book “Trillion Dollar Coach” written by Eric Schmidt, Jonathan Rosenberg and Alan Eagle in praise of their mentor, Bill Campbell.