To me, it looks like that part is missing as ads are not getting there even with approved status, but they show on a side.
This means that approved does not mean "approved for a premium area"
(I don't think there's a status for "approved for #1 listing or yellow box" either)
The very short story is that ads must be approved and then meet a Quality Score and CPC bid threshold to be sent 'up top'. If no ads meet that threshold, then none are shown above the search results.
More info here:
Can I make my ads appear above search results?
[adwords.google.com...]
Once on that page, be sure to note the two 'plus boxes' that lead to additional information.
AWA