Hello @Jennifer_Isaac,
Are you aware of Asana metadata?
There you can see: Created on, Created by, Completed on, Last modified on
This might be interesting for you: Reporting: How long do tasks take? - #9 by Sami_Linnanvuo
This might be a feedback request thread you are interested upvoting.
And here is all the info about being able to see time in stage: Workflow Builder • Asana Product Guide