I've already filed my 2019 return, turbotax automatically applied the retirement saving's credit to my return, i contributed $1,609 to my 401k, is that all i need to do?

Yes.  If you entered the W-2 exactly as it appeared then it showed your 401k contribution and applied the saver's credit.  You do enter anything else about the 401k unless you take money out of that (and you do not want to do that before you are 59 1/2  at least)

Thank you!