Automation for Milestone completed

I am pretty new to automations, and forgive me if this has been asked in the past. I did not find relevant discussion on my topic.

I have created tasks on my board, each with a date in a column called Timeline. Clicking the date, I have the option to select “Set as milestone”. With this selected, I would like to generate an automation that does the following steps: When Status changes to Done and only if item is in {task group} and task is “set as milestone”, then notify team member.

How do I make the recipe do this for a date selected as a milestone?

I am also interested in how to do this if anyone has any solutions