State tax filing

I did not file an extension and owed taxes, which were paid by the April tax date. I followed the instructions for If You Are Filing a Federal Extension here on the NJ Division of Taxation website. 
https://www.state.nj.us/treasury/taxation/njit17.shtml#:~:text=File%20Form%20NJ%2D630%20to,and%20mai....

Am I liable for a late fee?