This plugin helps you to see the post count for your custom post in the 'At a glance' widget in the WordPress dashboard. It also has a setting page where you can choose the post types for which you wish to show the count.
From your WordPress dashboard
- Visit Plugins > Add New
- Search for "Custom Post Count At A Glance"
- Install and Activate Custom Post Count At A Glance from your Plugins page
- Click on the new menu item "CPT Glance" under "Settings" and select the custom post to display count!