My DDD is the 22nd, but the IRS status bar says approved, not sent. What is going on?

The date given is an estimate.  Now, IRS has approved your refund to be issued.  You can see your expected refund issue date by visiting Where's My Refund? at IRS.gov.

My refund showed up sometime this morning. Thank you for your help.

That's awesome!

I'm in the same situation my ddd is today 4/18/18 does that mean have to wait longer to receive my refund

This means that your deposit should be the 22nd of this month but it can sometimes take your bank 2-3 days to process your refund.