1) yes
2) you can link it now
3) theres no known timeframe, for some its 2 weeks for some its more than 2 months
theres many different ways to link info, you may have to try it couple times. heres the steps i followed and these work most of the time:
Go to the following address:
http://www.cic.gc.ca/english/e-services/account.asp
Continue to GCKey. After you create your account, link your PR application to the account. (If you do not have a representative (lawyer), you will be able to link your application to your account)
1. Log in with GC Key account.
2. Permanent Residence > Family Class (Spouses)
2. Application Number and Family Name - Copy/pasted application number from email (including the F) and entered PA's last name.
3. City of Birth - I entered 1 space (hit spacebar once)
4. Country of Birth - Selected PA's country of birth
5. Passport Info - Did not enter any passport info
6. Other Application Info - Filled out the other application info as per our application and put '2' as the number of members in the application (Assuming 1 PA, 1 Sponsor, 0 dependents)