Should I apply now or take the SAT? ASU

I have a 3.2 GPA with a ACT of 22. I was thinking of waiting to take the SAT to get a really good score to raise my chances, but I heard that the faster you apply, the higer chances of you getting accepted. Should I wait to take the SAT and get my scores back which will take about 2-3 months or should I just apply without taking or using the SAT score?

You need to calculate your GPA in the Core competency classes required by the Arizona Board of Regents. If you have taken all the required classes and your GPA calculated using just those classes is still greater than 3.0, getting a higher score on the ACT or any score on the SAT will be irrelevant. From the ASU website

ASU welcomes applications from students with diverse academic backgrounds and interests. Freshman applicants who possess a high school diploma and meet the following requirements will be admitted to ASU.
English - 4 years (composition/literature based)
Math - 4 years (algebra I, geometry, algebra II and one course requiring algebra II as a prerequisite)
Laboratory Science - 3 years total (1 year each from any of the following areas are accepted: biology, chemistry, earth science, integrated sciences and physics)
Social Science - 2 years (including 1 year American history)
Second Language - 2 years (same language)
Fine Arts or Career and Technical Education - 1 year

Applicants must also meet at least one of the following:
Top 25% in high school graduating class
3.00 GPA in competency courses (4.00 = “A”)
ACT 22 (24 nonresidents)*
SAT
Taken prior to May 2016: 1040 (1110 nonresidents)
Taken after April 2016: 1120 (1180 nonresidents)*
*ASU does not require the writing portion of these tests.

More explanation is here:

https://students.asu.edu/freshman/requirements