It has been over a month since I filed my taxes and i still have not received my federal return. IRS refund tool says sorry for the delay. When will I get my refund?

Only the IRS can tell you.  TurboTax gets no information from the IRS after you file your return.  You just have to watch the IRS refund site.  If the IRS wants any additional information from you they will request it by sending a letter.

TurboTax doesn't get any updates on your refund after it is accepted by the IRS. 

You can track your refund using the Where's my refund? tool.