The IRS hasn't released it yet...possible by the end of the week.

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"Important! The updated worksheet will also be posted to IRS.gov on May 16th, 2019 but is already included in UltraTax/1040 version 18.3.7 and UltraTax/1041 version 18.3.6 software updates. The IRS will review returns filed prior to May 16th, 2019 to determine any needed corrections. These taxpayers do not need to file an amended return, call the IRS, or take any other action at this time."