Here is a link to the BG3 wiki:
BG3 wikihttps://baldursgate3.wiki.fextralife.com/Classes (if problem with link)
These are the planned sub-classes for launch. Notice that some have links to incomplete pages and others have no link at all. I am guessing that the ones with broken links will be ready for early access. Looks like Wizard is covered for early access.
Side note: For Rogue, it has been said that thief and trickster will be ready for early access. Now assassin has a link, which makes me think that it may also be ready for early access. Similarly the Warlock Arch-fey has not been confirmed for early access, yet has a link in place. The cleric too has more links than confirmed early access sub-classes.
