Federal tax return stuck in pending

I filed on 4/14 but the status is Pending. The email says it can take 24-48 hours to get it accepted but now it's passed the 48 hours timeline. The e-file details are down below. What could be wrong?

 

Received by TurboTax: Monday, Apr 14, 2:15 PM EDT

Received by IRS: Pending

Filing status changed to: Pending Monday, Apr 14, 2:15 PM EDT