In the past, TurboTax used to track the tax due or refund in the upper left section of the return, but I noticed that it is not doing that this year?
Per Why don’t I see a refund tracker or my taxes owed?, "you’ll see your refund or taxes due in the Federal Review section of TurboTax Online. For accuracy and simplicity, we show these totals after you enter your income, deductions, and credits instead of a running refund tracker at each step of the filing process."