"ProSeries won't allow me to efile the state tax return in advance of the federal return in hopes that the state refund will be received before the federal due date of 5/17/21. Any work arounds for this?"

I like the info I find from efile.com:

"Thus, technically you cannot e-File anywhere - not just eFile.com - a New Jersey Tax Return without also e-filing the IRS Tax Return. However, see these detailed instructions on how you can only prepare and mail in - not eFile - a New Jersey 2020 Tax Return"