E-File after setting up a payment plan

I used the Federal website to set ups payment plan.  I must say the whole process with Turbo Tax ad the Fed is very confusing.  Anyway I received "You have been approved for a Direct Debit Payment Plan (Installment Agreement) from the Fed.  So back in Turbo Tax do I select e-File and I will mail a check?

 

Also the way I understand the payment plan is they will process it about 8 weeks after filing.  Is that correct?  If so do I wait to file on 4/14 or file now?

 

Thank you.