Release dates: https://puri.sm/posts/librem-5-shipping-announcement/

Now that sounds somewhat realistic WRT the hardware: The finalised Librem1 hardware is planned to be delivered in batch "Evergreen" (Q2/2020).

For the software stack, making a release similar to SailfishOS 1.0 at the same time (Q2/2020) still sounds like "best case planning" to me, but appears to be definitely feasible sometime in 2020, given the current state of the software stack.