If your requesters don't belong to the channel where your Wrangle workflow posts (for example, if you have a sensitive HR or finance workflow that posts to a private channel), you can still keep your requesters in the loop by enabling the "Notify requesters by Slack DM instead of in the thread?" setting.
Once enabled, your requesters will receive updates via DM from the Wrangle app to let them know how the workflow is progressing.
Make sure your approval and task list step names are descriptive enough that your requesters understand what each stage means, since they won't have the additional context of the Wrangle thread.
DM informing that the first step has been completed and the workflow has progressed to the second step.