After you file

My tax return was already approved and I already paid in/ they already took what I owed so I see no new update because everything was already accepted.... I did my taxes back in January before the tax relief was passed.... So what do I do? How can I work out how much I am getting back or get the tax relief? I know I shouldn't file an amend but when I talked to a TurboTax expert on the phone last week they said I should be able to amend today, the 25th, to get my tax relief.