When I reviewed ERAS applications as a residency admissions officer, I used various "data filters" to sort applications based on certain criteria. I never used a filter to sort applications based on submission date. It is important to submit your application as early as possible but, if you haven't done so already, don't panic. Most programs haven't even downloaded applications yet for review.
IMG friendly programs may start reviewing applications earlier in the season because they don't typically await the release of Dean's letters.