That is not correct. Whenever it is the first year that you “should have” paid estimated taxes, there is no underpayment penalty. If it’s your second year, then you can just take your YTD earnings times your last year average tax rate. Round up a little and you’ll be fine. When you prepare your 2021 tax return next year, use the annualization option on the Form 2210.
Please remember that it’s also a good idea to wear a mask to avoid catching the vaccine from someone else.