You don't need the slips. You can pay directly on the IRS website https://www.irs.gov/payments
Be sure to pick the right kind of payment and year.....2019 Estimate
Pay California at
The 2019 estimated tax forms will only be available in the 2018 editions of TurboTax.
IRS Form 1040-ES - https://www.irs.gov/pub/irs-pdf/f1040es.pdf
California Form 540-ES - https://www.ftb.ca.gov/forms/2019/2019-540-es.pdf
You can use the IRS website for 2019 federal estimated tax payments using Direct Pay - https://www.irs.gov/payments
Go to the California FTB website to make a CA 2019 estimated tax payment - https://www.ftb.ca.gov/pay/index.html