If you have desktop TT 2024 you could use that to run a hypothetical tax return for your 2025 situation but it won't reflect the changes in the big bill and you may need to adjust for different tax brackets or changes in deductions. maybe some online calculators will be available before TT 2025.
To avoid penalty you need to have paid thru withholding or timely estimated taxes during the year, the smaller of 100% of your 2024 tax (110% if AGI > 150k or 75k if Married Filing Single), or 90% of your 2025 tax - this is your "safe harbor" amount. (See lines 1-9 on Form 2210 where this is calculated).
So if this 1099 work is significantly increasing your income from 2024 to 2025 you may be able to pay estimated tax based on 2024 tax. Then it doesn't matter how much or timing of your 2025 income. The only snag is now that it's Q3 you would need to catch that up for Q1-2 and there will be some penalty on those quarterly payments until you pay that but it will only be a few months, and that may be offset by deferring payment of higher 2025 tax until April 2026.
If 2024 option doesn't work then once you figure out some sort of estimate for 2025 tax, you can either pay that quarterly and similarly have some penalty due to late payment of Q1/2 ES; or, pay it in Q3/4 in line with your 1099 earnings and use the "Annualized Income Method" on Form 2210 next year to show how the uneven income and uneven estimated tax lines up, but this will involve some extra calculations on your part to determine your AGI/withholding/Qualified Divs/LT Cap Gains as of 3/31, 5/31, 8/31 (12/31 being your full year return). In TT this is info is input under Other Tax Situations / Underpayment Penalty section but TT won't calculate those quarterly figures other than the full year. And you have to follow similar for state.
I'm not sure the effect on your social security and how that plays into the AI method if that is regarded as evenly earned thru the year while your 1099 is uneven - but maybe the big bill helps you here; the AI method should certainly reduce your penalty if your income and estimated tax payments are backloaded later in the year, but may not eliminate it.
Not a CPA, hope that helps think about options - for more info see:
https://www.irs.gov/faqs/estimated-tax
https://www.irs.gov/pub/irs-pdf/i2210.pdf
https://turbotax.intuit.com/tax-tips/general/taxes-2021-7-upcoming-tax-law-changes/L3xFucBvV
