When reviewing a roadmap it could be visually compelling to represent the milestones in a timeline that could be embedded on an iframe (for website use, for instance).

Note: These milestones could be related to actual milestones in GitHub if the integration is linked.

Shouldn't need to be all of them yet few options could be:

• Selected feedback cards would show in a timeline ("Estimated" field would be mandatory)
• All the statuses grouped and ordered in time >> deploy would give you a detail of the cards

Some other complementary options:

• "You are here" marker, which would indicate where in the timeline the viewer is
• Progress bar for the milestone as the Github integration is running with a workspace and Issues are linked to a milestone itself.

Sample of visualization attached. Just conceptual.