Over 35 million returns were filed in the first week alone that the IRS was open so things are moving slowly.
Tax Season Refund Frequently Asked Questions | Internal Revenue Service (irs.gov)
Also, if you claimed EITC, the earliest they could send returns is this week. Stay patient. I filed 1/20 and my return was accepted 2/10 with a transmitted date of 2/12. I still haven't gotten my refund and today (3/03) is my 21 day window date.