Given the time-frame that you mention, it might be safer to stick with Maya than to attempt to import into Blender, then export out again, especially given the link that rdb provided just above.
If you want to check whether your model is exporting with collision, open the exported egg file in PView, then press shift-c; if the collision geometry is present, it become visible.
As rdb mentioned, be aware that just exporting collision geometry doesn’t cause collisions to work on the game–there’s a little work to be done in the program itself, too–again, see the example to which I linked in my prevous post.