The IRS states the you should receive your refund in 21 days from the date the return is accepted by the IRS.
The IRS may take up to a week to update your return status.
If for any reason, there is an issue, the IRS will notify you by mail.
You can always call them. 1-800-829-1040
There are a few ways you can track your tax return.
However, if you received the EIC/EITC, there are delays. I am posting a link below with that information.
https://www.irs.gov/individuals/refund-timing