How to check the number of leads currently on the node?

1. To open a campaign, go to the Campaigns section from the sidebar and select the campaign you want to view. Once you click on the campaign name, you will be redirected to the campaign overview page. 

2. In the campaign overview page, open the Builder tab. Then click on the Stats option available on the action node to view the number of leads that have completed the action, are currently in queue, or have failed for that particular step.