Married filing jointly and checking box 2(c) with two incomes is appropriate. However, this may still lead you to a tax bill at the end of the year, due to the IRS widening the tax brackets for 2024, and with the varied income. I'm not sure why you wouldn't have had the option to complete step 2(b) along with the worksheet on your W-4. This is a link to the most recent version of the W-4 that you could use to work through the worksheet for 2(b) to determine the appropriate extra withholding to enter in step 4(c), if needed.
https://www.irs.gov/pub/irs-pdf/fw4.pdf
Alternatively, you can use this TurboTax Withholding Calculator to guide you through some basic questions to arrive at any potential withholding required.
Hope this helps!
Cindy
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