State tax filing

I e-filed my returns on 4/15.  My Federal and NY returns were accepted the same day and taxes due were debited from my account already.  However, my NJ return is still pending.  It's now past 4/18.  I'm beginning to get worried.  What is the problem?  I saw that TurboTax says it's fine as long as I transmitted before the deadline but it also says it typically takes 24-48 hours.  Now it's way beyond 48 hours.  How do I prove that I filed on time if NJ says I'm late?