Here's an example of the steps above:

1. Go to http://www.airmilesmegamiles.ca
2. I chose BC, then I clicked "Save" for the following:
3. Safeway: Spend $60, get 5X Base Miles - saw the logo added to top of page.
4. Thrifty Foods: Spend $60 or more*, get 5x the Miles. - saw the logo added to top of page.
5. Thrifty Foods Pharmacy: 20 AIR MILES when you spend $10..." - saw the logo added to top of page.
6. Shell: Get 10 AIR MILES on 25L fill of Bronze/Silver - saw the logo added to top of page.
7. Shell: Get 20 AIR MILES on 25L fill of Shell V-Power - DID NOT see ANOTHER Shell logo added to top of page

Here's a screenshot of the dynamically updated list of partner logos at the top of the page.



Note, only ONE Shell logo, even though I selected BOTH Shell offers.
Also, you can see that Safeway, Thrifty Foods and Thrifty Foods Pharmacy are all separate partner offers.
If you don't get FIVE partners for 1250 BAMs, you could also get 650 BAMs for fulfilling 3 partners.

Hope that clears things up on how to check if you'll meet the conditions to qualify for the promotion. Enjoy.

EDIT: I don't want to turn this into an Air Miles MegaMiles promo thread, so I'll just add onto this post.
Even if you have used the Shell gas 25L coupon once for the MegaMiles promo, you can continue to use it up to 6x for the 10 BAMs on 25L fillups. In my case, I also had a concurrent offer to "Fill 25L four times for 100 BAMs", so I've been going back to Shell for my fills, and used the MM coupon all 4 times to get 4x10 BAMs, plus now the 100 BAMs have posted for that separate non-MegaMiles offer. That's 140 BAMs already.