I just did this...
Unfortunately, I had to cancel my Sept Canada/NE cruise. I ended up booking a different cruise on a slightly different embarkation day. I told my TA to cancel my old cruise and he a reminded me to cancel my cruise planner purchases first. I knew this but in the flurry of the moment had forgotten.
I made the cancellations, on the 5th of June and the credit showed up in my online banking on the 8th dated for the 7th.
My suspicion is the credits will come for the OP but may take a little longer.