There are several places you can check:
1. Check with your bank and see if the payment is "pending"
2. Check your filing status to see if it is accepted by IRS (log back in Turbo Tax and you will see your filing status on the first screen you see.
3. Check with IRS directly to see if payment is being processed. You can call IRS e-file Payment Services 24/7 at 1-888-353-4537 to inquire about or cancel your payment. Here is more information: https://www.irs.gov/payments/pay-taxes-by-electronic-funds-withdrawal#errors