Pre-tax IRA contributions from employer

My employer contributed $2600 pre-tax dollars into my 401b IRA--subtracted from my taxable income on my W-2.  Turbo Tax prompts indicate adding my IRA contributions figuring my 2019 return.  Do I enter $2600 when asked to enter my 2019 IRA contributions?  I didn't include that in my 2018 tax return, but wondered if I could have?