Supposedly we'll find out
Soon™ but DC said on 28 April that they are going to release chunks which are "like one story or one character or whatever."
From the end of April report by DC on Patreon:
The initial Tech Update release will only consist of the main "home" stories (Jenny and Debbie), 1st day at school and minor locations. Despite having the majority of the game converted for the Tech Update, this will be the first "part" of the game to be released publicly... At present the plan for these releases is for them to be character centric, focusing on adding in whole character routes at a time.