According to New Jersey Division of Taxation, "a Taxpayer can get information on the status of their New Jersey income tax refund either online or by phone (by calling 1-800-323-4400).
Taxpayers can access the Income Tax Refund Status for NJ Taxation site at the following link as shown below;
https://www1.state.nj.us/TYTR_TGI_IN.../COMMON/prompt.
Here the taxpayer can enter their social security number and exact amount of their tax refund expected and the system will respond by specifying the exact date of the direct deposit refund or mail date.