Well, that seems to line up with Wikipedia:

The imperial cup was defined as half an imperial pint. The unit is no longer in use.

In Canada, we're definitly schitzoid with measures, switching fluently between inches and metres, cups and litres, etc..

Non-commercial cooking and woodworking generally use imperial units (cups, inches), for roads/driving we use metric, for weather we use both (degrees C/F, baramoter, etc..).

For official/commercial purposes, only metric is valid. But being so close to the sleepy giant beneath us, we're not likely to become absolutely metric for some time yet.

Cheers