That is not effective until you prepare your 2021 tax return next year. It is not a part of a 2020 tax filing.
OF course, they were talking about pre-paying that monthly starting July.....or later and how that "might" proceed has not been fully determined....but that probably also depends on you having already your 2020 taxes filed ....so get that done in the next few weeks.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
