If you want to check how your automated campaign performs, go to Reports and select a workflow. There you will find all emails sent in a given sequence. Alternatively, you can select the workflow in the Campaigns section and then click View report.
After clicking View report of the selected campaign, you will be able to see the statistics.
The number of emails sent will show an overview of the last 30 days. Opened, Clicked, Unsubscribed and Bounced numbers on the main page of the report will show you the overall engagement.
On the right-hand side, you can see the most recent engagement. If you'd like to view or export the Opened, Clicked, Unsubscribed or Bounced contacts from the last 7 or 30 days, you can do it by selecting the relevant option in the Activity drop-down.
In automated reports, it is not possible to see how many contacts are queued for the next email in the sequence. However, you can always use the search bar in a specific list to look for contacts that subscribed after/before a set date. This could give you an idea of how many contacts will receive it.