The steering committee has asked a project manager experienced in agile to provide an indication...

A release burndown chart is a tool that shows the amount of work remaining in a project over time, based on the estimated effort and the actual progress of the team. It can help the project manager and the steering committee to monitor the project performance, identify any deviations from the plan, and adjust the scope, schedule, or resources accordingly. A release burndown chart can also provide an indication of the time remaining on a medium-sized project by comparing the ideal and the actual burndown lines, and projecting the completion date based on the current velocity and the remaining work. A release burndown chart is especially useful for agile projects that work in short iterations, as it can reflect the changes in the backlog and the scope due to feedback, reprioritization, or new requirements. References:

PMBOK Guide, Sixth Edition, Chapter 6, Section 6.7.2.1

What is a Burndown Chart? by Agile Alliance

Burndown Chart: What it is, How to Use it, Example by Asana

Burnup Chart - Sprint & Release Tracking by Tech Agilist