As Amy points out, prior to this year, so few people needed Schedule W that it was not part of the set of forms that TurboTax supported. And, unfortunately, 2021 has been a year of Congress, the IRS, and the state constantly "moving the goalposts" on nearly a daily basis, so there haven't been the resources to add a previously unsupported form.
Curiously, the current Schedule W on the Delaware website is for tax year 2011. So what you will want to do is to download and print the current Schedule W worksheet (here).
Complete this form to apportion your income.
Then when you file your Delaware nonresident return (you are filing nonresident, right?), TurboTax will list in the Delaware interview the various types of income reported on your federal return (wages, capital gains, etc.) and ask you to enter the amount allocated to Delaware. Enter zero in all the boxes (for the various types of income), except for Wages. For Wages, enter the amount from line 7 of the Schedule W worksheet.
Then be sure to put your completed Schedule W in your personal tax file, in case the state ever asks you about this. There isn't a way to attach the printed Schedule W worksheet to your e-filed TurboTax return (of course, if you are printing and filing your Delaware return, you can add your printed Schedule W worksheet to your return before you mail it).
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