'Members by Status' Not Shown on Engagement Program Summary - Only 'Members by Stream'
The 'Members by Status' section that you can see on the Summary page is replaced by the 'Members by Stream' section in an Engagement Program.
You should be able to see how many members have which Status on the Dashboard page. This will also show any additional Statuses that you may have added to the Channel.
However, all of this information is available on the Details page for the Engagement Program in Marketo Sky.