Priority or Mailgram ACT Reports

<p>Will University of Chicago require my score report from ACT on Jan. 1? I am sending away for my score report tomorrow through snail mail since UChicago hasn't gotten my scores yet. Is it okay to request a Regular report, Priority, or Mailgram? Meaning, how fast do I need to get the scores there?</p>

<p>Thanks for your help.</p>