Well ideally we will be done with the launching of early access around November or early December. However there are a few oddities we need to overcome. Stuff like steamworks integration and cloud saves (as right now our saving method is to create a bunch of jpgs for photos on the HDD).
If that date slips it won't be any later than late Feb 2025. For the rest of Phase 01 a majority of it is putting in game the already recorded dialogue and building the missing systems. Nests will take a bit of time though. So maybe a couple more months after the launch, ball parking maybe 6 to 8 months.
Then each following phase it's the following: building the environment, building minimum 9 new monster species, making their nests, making the narrative content for the region, making side quests and puzzles, building new hazards, etc. so I would give each region like... 10 months each. We plan to do 5 total regions so after phase one it would be like maybe 2 to 3 more years of work to build the full base game.
Having said that, if we hit good goals on early access in terms of sales we can expand the team from 5 dudes with a dream to say 8 or 9 human monkeys making Shakespeare. It would significantly improve the dev speed.
But none of these days are set in stone. So take it with a grain of salt.