Just planted 2 blueberries in large pots on my balcony. I should have asked before I bought them. Is Jersey & Bluejay good
pollinators for each other?
That should be fine. As you might already know, blueberries are largely self-fertile, but having more than one variety of the same time (northern highbush, southern highbush, or rabbiteye) helps to produce larger fruit and larger crops. Jersey and Bluejay are both northern highbush and will likely have some bloom overlap.