401(k)s are individual accounts. Each of you can contribute $19,500 to your separate accounts (plus an additional $6,500 if either of your are turning age 50 or older in 2021).
Your wife's employment status will not affect your 401(k) contribution. If she is not employed, she will not be able to contribute to her 401(k).
If you both maximize your 401(k) amounts, then there is nothing to change, unless you want to reduce one or both of your contribution amounts. Sometimes when two people get married, it's helpful to increase 401(k) contributions to lower your total income. This doe not apply if you are both at the max.
If you file together for 2021, your tax rate will be based on your combined income. Sometimes this results in more tax than if you filed as single. The tax tables are adjusted for married filing separately. This only applies when going from two single fliers to either married joint or two married filing separate returns.
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