Yes, you can contribute to your solo 401(k) for 2022 before the filing deadline of April 18, 2023.
You must have opened your solo 401(k) by Dec. 31, 2022, to make contributions for the 2022 tax year. If you decide to make a 2022 solo 401(k) contribution in 2023, make sure your broker applies your contribution correctly. Some may default to a current-year contribution, and that can cause problems between you and the IRS if you try to write off those contributions on your 2022 taxes.
Please see this TurboTax Help article about how to enter a Solo 401(k) contribution.
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