Refunds take about 21 days after the IRS has accepted your E-filed tax return. If it has been more than 21 days, you will have to speak directly to the IRS to find out more about the delay. Please see below for more information.
https://ttlc.intuit.com/community/refund-status/help/what-if-my-irs-refund-is-taking-longer-than-21-days/00/26080