@tstockhorst and @Treegirl7623 If you're tracking your refund through Where's my Refund and you haven't received your refund on the date posted, you could reach out to your financial institution to see if they have received your refund. If they have, you can also ask when they will release the funds to you.
If that isn't the case and your refund goes beyond 21 days and you still haven't received it, see this FAQ regarding What to do if it's been over 21 days.