In the Folders view, click on the deployed version of the Hello World task and select the Results tab in the right pane. Hit F5 to refresh the tab since task results are not automatically refreshed. On the Results tab there is a line for each command in the task, with a Result Code that indicates if the command succeeded or failed. A Result Code of 0 indicates success.

To see the results of a task execution displayed in different ways, select the Recipients tab for the deployed task, or look at the Events or Tasks tab of the Agent that executed the task.