After you file

my question is:  since I provided my bank info, why does Trubo Tax say NOW THERE'S ONE MORE THING TO DO:  PRINT YOUR 1040V andMAIL WITH YOUR PAYMENT, when I have already filled out how much I am paying and the balance on installment which is part of the paperwork I submitted in my efile.  also, when I printed my returns, the vouchers were also printed:  1040 ES.  my estimated amounts are quite big, and I assume they will also be electronically paid, should I mail these payments or is it safe for me to assume IRS will collect it automatically?