The IRS has started to pull test returns and acceptances have been given on those returns HOWEVER they will not start processing returns until the 29th so don't expect any refunds before 1/7/18 at the earliest and if your refund includes any EIC or ACTC then those will not process until 2/15 and those refunds are not expected out before 2/27.
What you need to do now is check the IRS site periodically for the current status of your return ... don't try more than once a day as you may get locked out & they only update the site once a day usually overnight.
https://www.irs.gov/refunds
