When you activate or manually run a pipeline, it's easy for you to see what's happening. The activity tab pops open automatically, giving you information on all the running, completed, or failed instances of your pipeline. If you want to dive deeper, you can click on each instance to get a detailed breakdown.
Note: If you close the pipeline and come back to it later, you won't find the activity records in that bar. You'll need to go to the activity log page for all the historical data.