Boston squash

Has anybody ever grown a Boston squash?
Trying it this year for the first time and there's not a lot of info for help....
I've got two vines and only one squash has grown, although there are still a few flowers. Squash that has grown is a big one.
Cleared the leaves around it so that light gets in. Not sure if I should harvest it? Does it need to harden before use?
Should I concentrate on the one that's grown and take off the rest of the flowers?
It's a winter squash (I think) so am I being impatient? Should I leave it alone for another few months?
Any help would be fab!

 

Hope this helps until the experts arrive.

Curing Pumpkins and Winter Squash

 

Thank you @mazambo thats very interesting.
Definitely sounds like I shouldn't harvest mine yet though as the vines are still green and flowering

 

I'm glad it was helpful to you @ridgiemum