On top of the future two biomes (three with ocean), it is also difficult to say if the currently implemented biomes are 'complete' either. In addition to going back and adding small bits of content to earlier biomes, quite a bit of overhauling has been done to a variety of things like terrain generation, food balance, enemy models etc.

If you are trying to size up how long the wait for 1.0 may be, it's probably a couple of years at minimum. The devs rate of output would need to multiply a few times over to beat fall 2024.

Presumably things will speed up as the final vision comes together more and the newer staff are more comfortable in their roles, however this is not a guarantee especially when a project can instead become more ambitious.