When will you actually know of the decision?
Some info that might be of help to you.
I still suggest calling and perhaps you will get someone on the phone who will actually tell you. Letting them know that you need to plan your life (and perhaps respond to some other opportunity)might get you an answer.
1) Some people's webadivsor status changed this past week, and so a decision has been made.
2) This is the case for my son, but unlike prior years when some on this forum indicated that they were able to call Chapman and find out over the phone, he was unsuccessful in getting anyone to tell him on the phone on Friday. The person indicated that they do not tell people over the phone.
3) His webadvisor had indicated that things had been mailed on March 13th, yet person over the phone indicated that most of the recent decision mail that had been sent out was actually mailed on March 15th or 16th regardless of whatever prior information you might have had. Transit time will be 3 USPS biz days from Chapman/California to Oregon. To parts of California it'd only be 1 or 2 days, so some people probably heard today, Saturday, in the mail.
Unfortunately the school holds the cards and the power, but I find it slightly insulting to keep people waiting in the day of email, and phones. You will invest 3 years of your life, over $100k in tuition, and one of the early interactions is being placed on "snail mail" hold. Chapman has an excellent reputation and comments on this forum of those who are currently there are positive, yet some of those same students indicate that the administration at times does not have much idea of how to be supportive of students. It seems like this is an early example.