Chuck,
It's a good thing that you got that email about your high school info. It means that they have reviewed your application. And just like Nid said you'll probably get an email for an interview in the next several weeks.


HJS,
It is not required to have 3 internal Delta recommendations but you do need:
"Delta requires a minimum of 3 references with one reference having known you for a period exceeding 10 years."

I only had one internal Delta recommendation, and it was posted after I received the email for an interview.