After client e-Signed the return, I caught the electronic payment option was not checked.  As that is what client requested, I checked the box and e-filed the return, defaulting payment day is 5/17/21.  I believe the electronic payment election was transmitted to the IRS, but how do I make sure of that?  

Client told me they did not see a payment went out of their bank today.  How many days does the payment clear the bank, and how do I verify whether this payment election was truly transmitted to the IRS?