For 2024 you will file a joint return and there will be a question in TurboTax in the Personal Info section where you can check a box indicating that your spouse passed away before filing the return. Once you've checked that box, you will be asked to enter the date of death.
Next year, since you have qualifying dependents, your filing status will most likely be "Qualified Surviving Spouse" and then in years following your filing status will likley be Head of Household. Each year, TurboTax will ask you the questions necessary to determine the appropriate filing status based on current tax law and your circumstances for that year.
The screen that you will be looking for this year will look similar to this one:

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