@Retired2022 - you can pay an estimated amount at the IRS website and then just show it as a payment when you do your tax return. the next estimated payment due date is Jan. 15, 2023. Consider State taxes if you live in a state that has income tax; it probably has a payment website as well.
Also, if you are not careful, TT will think there is a penalty for underpayment of taxes. if you work your way Form 2210 you can avoid it. Your 2022 is 'lumpy' because of the Roth conversion and the form, if following correctly, will accomodate your situation.
https://directpay.irs.gov/directpay/payment?execution=e1s1
this is an great calculator you can use to estimate your federal tax:
https://www.dinkytown.net/java/1040-tax-calculator.html
