As long as your return has been transmitted, you should wait to see if it is accepted. Until you know that, you should not file a paper return. Also, there is no need to file an extension because you filed your original return on time, regardless of whether it has been accepted yet.
Take a look at the following TurboTax help article for information about how to track your refund after you are notified that the return has been accepted:
How do I track my New Jersey tax refund?
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