If your return has been accepted, then you need to check the IRS website Where's My Refund for the status of your refund.
https://www.irs.gov/refunds
If you are not sure your return was accepted (if you e-filed), then you can check to make sure it was accepted.
https://ttlc.intuit.com/community/return-status/help/how-do-i-check-my-e-file-status/00/25538
