how far along is optifabric 1.19's development?

When will the 1.19 optfabric come out?

When it is ready ;) Just be calm.
And if you want it to be faster you can probably help with a pr?

Considering that Optifine only just released pre-release 2 for 1.19, I would arm myself with patience.

Yeah, i could see it being hard to put out the optifabric/optiforge without a completed optiine to work from.