The sources

The Economic Potential of Generative AI: The Next Productivity Frontier

McKinsey & Company · McKinsey Global Institute · June 2023

The 60 to 70 percent automation figure.

Cited in

McKinsey & Company. 'The Economic Potential of Generative AI: The Next Productivity Frontier.' McKinsey Global Institute, June 2023. (The 60 to 70 percent automation figure.)