Interested in the academic side of positive psychology? Here are just a few that have good discussions of this topic and proof that it can be beneficial.  I will add some summaries and other articles in the near future too.  

Articles:
​Simmy Grover, Adrian Furnham, "Coaching as a Developmental Intervention in Organisations: A Systematic Review of Its Effectiveness and the Mechanisms Underlying It" PLoS ONE | DOI:10.1371/journal.pone.0159137, July 14, 2016

Stefanie Richter, Llewellyn E. van Zyl, Lara C. Roll, Marius W. Stander, "Positive Psychological Coaching Tools and Techniques: A Systematic Review and Classification", Frontiers in Psychiatry, 09 July 2021 doi: 10.3389/fpsyt.2021.667200

Angelina Roša and Natalja Lace, "Assessment of the Impact of Coaching on a Company’s Performance: A Review of Methods", Journal of Open Innovation: Technology, Market, and Complexity, 2021, 7, 233

Martina Buljac-Samardžić, Marianne van Woerkom, "Improving quality and safety of care in nursing homes by team support for strengths use: A survey study. PLoS One 2018 Jul 2;13(7):e0200065. doi: 10.1371/journal.pone.0200065.