The following sources were cited in SAP Digital Futures Issue 37: Robotic Process Automation: The Dawn of Unlimited Intelligence.

Robotic Process Automation (RPA) is the simplest way to get started. It leads to happier customers, employees, and improved productivity and accuracy.
1https://www.computereconomics.com/page.cfm?name=Technology%20Trends.

In 2 years, 25% of employees will use a digital assistant every day.
2
https://www.gartner.com/en/newsroom/press-releases/2019-01-09-gartner-predicts-25-percent-of-digital-workers-will-u.

Enterprises are projected to use over 1 billion virtual digital assistants by 2025.
3
https://www.computereconomics.com/page.cfm?name=Technology%20Trends.