It is possible that the IRS cannot or have not yet verified the information that they requested. If your entire refund is from income reported on your W-2 then until they can verify that information the return will be on hold. It could take months to process thru.
So for now ... you wait. Check your online account to see what if anything is happening to your return : https://www.irs.gov/individuals/get-transcript
https://www.taxpayeradvocate.irs.gov/notices/letter-12-c/
https://www.irs.gov/individuals/understanding-your-letter-12c
