I filed my taxes electronically with TurboTax on the TurboTax web site about 20 days ago. I owed an amount, but I can't see any tax payments appearing in my bank account now, about 20 days later.

Should I be concerned? How should I investigate it and be certain I successfully sent the tax to IRS's way? I did receive TurboTax's automatically generated confirmation of successfully completing tax filing electronically the day I did my tax on their web site.