I also filed a New Jersey extension yesterday and it shows 'Sent to State' (along with one from California). Just waiting for acknowledgement.

This entire las week, California tax returns were taking a couple of days to receive acknowledgements and when they came through, the date accepted was the same date as filed two days prior.

My client also lives in New Jersey and works in New York. All W-2 withholding belongs to New York. 

He received a credit for the full amount of tax on the New Jersey tax return with a zero balance.

Hope this helps..