It used to be that you had Earned-Value Management and the concomitant EV Charts. One could take the first derivative of the current point on the chart (or perhaps do something fancier involving moving weighted averages) and use that to predict[1] how the EV chart would play out in future.

But EV charts and first derivatives are old fashioned and hokey. Practically waterfall!

Instead we use the latest in agile management: burndown charts and velocity. Totally different.

[1]: Though see every software project ever for an example of why linear extrapolation is a hilariously foolish way to settle on a firm estimate.