I know this is a late reply, but here's the info from the ACT website
Multiple-choice scores from this test date will be first posted online beginning September 27 through November 5, 2010.
If you take the ACT Plus Writing, your Writing scores will be posted as soon as they are ready, normally about 2 weeks after your multiple-choice scores. Your scores cannot be reported until after your Writing scores have been added.
Score reports are usually mailed within 3 to 8 weeks after the test date. (Please allow an additional 1 to 2 weeks if you test in a country other than the U.S. or Canada.)