The current plan is to make Access RT 2019 available for customers to install from the Office Deployment Tool. This should be available in the second half of 2019.
The recommendation for Office 2019 perpetual consumers, is (and will remain) to install the free version of O365 Access Runtime from the download page.Thomas Becker commented
Any forcast date on Access RT 2019 yet?
I don't think Microsoft really understands the needs of Access developers.
No RT 2019
None 64 Bit OCX
Constant problems with updates with MSCOMCTL.OCX
Damaged databases after update of MSRD3x4.dll
and so on
My customers now think I'm a hobbyist because they can't believe Microsoft makes so many mistakes.