Mine are already working flowers. Have been for several weeks.

Yours should not stay indoors. They are already adults and will leave the cocoons when temps are 50 to 55. In other words, they were probably kept in a fridge before you got them.

If they are still indoors, take them out now or you will have loose bees in the house by morning.

Put them outdoors in a sheltered place on the east or south side of the house/structure. They will come out when the temperatures are correct for them.

The males come out first, in normal conditions, a week or two prior to the females. Then they'll mate near the same tubes they just left.

See this
- http://county.wsu.edu/mason/gardening/Documents/OrchardMasonBees.pdf

and this
- http://puyallup.wsu.edu/plantclinic/resources/pdf/pls112orchardmasonbee.pdf

Here is a link that might be useful: mason bees