This article shows you how to create a timeline in Google Slides. You can use the timeline charts as templates to save time, or create a timeline from scratch using the design tools in Google Slides.
How to Make a Timeline in Google Slides
A timeline is a special kind of diagram, so you can use one of the diagram types as a template to quickly insert a timeline into a Google Slide.
On the slide where you want to place the timeline, select Insert > Chart from the Google Slides toolbar.
In the right sidebar, select the Timeline template to open a gallery of different timeline designs.