If you e-filed your return then you can check your e-file status to see if the IRS accepted your return.  If your return is accepted, the IRS has received your return to be processed, once your return is processed your refund will be approved.  

You can check the status of your e-filed returns. 

How do I check my e-file status?

https://ttlc.intuit.com/community/return-status/help/how-do-i-check-my-e-file-status/00/25538

If your return is accepted, you can checked the IRS website Where's My Refund for your Federal refund information?

https://www.irs.gov/refunds

If you have a State refund, click on the following link, then click on your State

https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571