2020 Federal return was accepted but I haven't received and acknowledgement from the IRS, doesn't appear on Where's My Refund!

I filed on May 12th, my Federal return was accepted (according to Turbotax) yet I haven't received any acknowledgment from the IRS. I'm concerned because my return doesn't appear on the Where's My Refund page at all.  Here is what it says:

 

"We cannot provide any information about your refund. You must wait at least 24 hours after you get the acknowledgment e-mail that your tax return was received by the IRS"

 

It's been more than 24 hours and I never an acknowledgment e-mail. Turbotax says I should receive my refund by June 2.  Should I be concerned?

 

Thanks!