OK so from the above, the detailed answers is:
No optimistic delivery date exists. Simply check back every few months if there's a new stable release by running UBPorts from a spare SD card.
There's no known date of when Ubports on PinePhone will be able to work as a daily driver, so for now either:
go for another phone if you still really want to use UBPorts
go for another distribution if you really want to use Pinephone
Thank you all for the answers. Case closed.