Define "Complete". There are endings you can reach on Mike's route, but content is still being added to it. (for example, the update in progress is, I understand, the final touches to the Office Harem. Assuming that also adds an ending to the girls in the Office Harem, I'd guesstimate that provides an ending with a bit over half of the girls in the game.)
That said, there is virtually no content for the Bree route (Mike can currently form a relationship with a bit over 20 girls, I believe. with a few teasers, whereas I believe Bree only has 2 guys available, (and I believe only 1 of the girls)). Judging by a recent post on his patreon, (link to his patreon in the more information section above) it's unlikely there ever will be much. Apparently there isn't much support among his patreon subscribers for the Bree route however it does read like he is attempting to gauge how much support there would be for a separate, but similar, game with a female MC.