You can view the newsletter statistics here.
You can see all emails statistics and campaign statistics.
The queue statistics and cron/scheduled task statistics are also available.
In the Email Address Statistics, we can see the total number of Pending emails, Unsubscribed emails, Active emails and Total emails.
Queue Statistics displays the number of emails fired in current hour and hourly email sending limit.
Campaign Statistics shows the number of pending, paused, active and all email campaigns.
Cron Execution Info displays the cron start time and cron end time.