I checked my status at this site: http://myuw.wisc.edu I guess you have received an email regarding the activation of your id for this site, after you have submitted your application. My status at this site is "Chemical Engineering PhD: pending"
I do think the committee has started reviewing applications, and I'm not sure if they have almost finished it, as some my classmates from other major have received invitation of interview. But I submitted my application near the deadline, so I'm not sure if they have seen my materials.