yurt if you notice, most of what you linked were cases held around january/february. It would then take around ~3 months to have an official ruling, and then even after that it takes a bit for them to publish.They tend to release a lot of their decisions all at one time, for a cluster of cases.
Also I think june in particular has a lot of rulings released because it's the end of the supreme court term.
So we are awaiting a big cluster of supreme court decisions, one of those is specifically the ACA, and I was wondering if it's always at the end of the month or at anytime, but I guess it's going to be anytime at this point given they've already started releasing a few this june.