The field called ‘delivery’ in Facebook’s UI is not a single field returned by the UI, but is based on examining the status, start/end dates, etc of the ads–you could replicate this yourself by examining the ads and their parent objects.
I’m not sure I understand what you’re saying about “configured and effective status”: if an ad was paused, both its effective and configured status should be PAUSED. If, for example, an ad’s Ad Set was set to paused, the ad’s configured status would remain ACTIVE but its effective status would be ADSET_PAUSED.