If you actually requested that the Traditional IRA be converted to a Roth IRA during the calendar year of 2024 and you received a Form 1099-R that has 2024 at the top, then it should be reported on your 2024 tax return.
If the conversion took place in the calendar year of 2025, then you should received a 2025 Form 1099-R to be reported on your 2025 tax return.
If your spouse's Form 1099-R included a distribution from a Traditional IRA which had a combination of pre-tax and after-tax contributions in the account, then the conversion will not be completely non-taxable. The follow-up questions after entering the Form 1099-R distribution should ask you about your basis in the account (non-deductible or after-tax contributions) and also the total value of all Traditional IRAs. These values will be used to determine the amount of the conversion that is taxable on your return.
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