The work is ongoing, it might take until the next release: https://www.phoronix.com/scan.php?page=news_item&px=Coreboot...

I really like https://floraincognita.com/ (which is connected to a public research project).

While I really like Plantnet, I much prefer https://floraincognita.com/ (which is an actual research project).

CalyxOS might be worth a look!

It's available one for Pixels and the Mi A2 and offers seamless updates, microG and a closed bootloader!

https://calyxos.org/

My project DivestOS supports bootloader locking, verified boot, and OTA updates for many more legacy devices.

https://divestos.org

If you want to stay with Android, maybe have a look at CalyxOS. They integrate microG and flawless system updates while keeping the bootloader locked. Only works on Pixels and the Xiaomin A2 though. Imho it's the one Android distribution that has the right balance of privacy and usability. I flashed it for my mum and my sister and there wasn't one complaint yet.

The F(x)tec PRO¹ might be of interest to you. Comes with a full keyboard and LineageOS support.