If you opted to receive your refund via a pre-paid card, you can call the number on the card for details on your refund after it has been released by the IRS.
When the status of your refund is Refund Sent, it means the IRS has sent your refund to your financial institution for direct deposit. This status will tell you when your refund was sent to your bank. It may take your financial institution 1 – 5 days to deposit the funds into your account. Please wait until it’s been five days from the date we sent the refund to your bank to check with your bank about the status of your refund. This time frame is provided to allow for the variations in how and when banks deposit funds.
If you haven't received your refund in your account after the 5 day waiting period, you can call the IRS. IRS representatives will be able to research the status of your refund if your return was accepted (received) more than 21 calendar days ago. The number to call them at is 1-800-829-1040, but prepare yourself for a potentially long wait times.
Please see the following IRS link for more information:
https://www.irs.gov/Refunds/Tax-Season-Refund-Frequently-Asked-Questions