If I'm filing on my own after splitting with my spouse and they have not filed their 2022 income tax, how am I supposed to know what their income is to input?

We are split before the end of 2022 and are doing our taxes separately but the program is asking for his federal net income, which I dont have.

When you don’t know your spouse’s income and can’t find out through reasonable means, the CRA recommends that you enter your best estimate.

The CRA will assess you and your spouse’s (or former spouse’s) returns together to ensure that credits and deductions were correctly applied between you. If there’s any inaccuracy or mismatch, they’ll reassess your returns.
Tip: You may want to save your tax refund (if any) until you receive your Notice of Assessment or Reassessment in case some or all of it needs to be repaid.

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