I guess your gckey is not updated due to large volumes of applications they have processed each day. As observed, when one gets a PPR, background check was done and decision had already been made. Well as for us, we dont have a pre-arrival invitation but our BGC is already in process. We were not asked for any additional documents. No updates since February 28 when our documents were transferred to MVO. For more than 4 moths of waiting, thats the time we received an update in our gckey where our background check had started. Majority of the applicants have almost the same flow of processing their applications but ours are different from them. Maybe they just forgot to update your account when your approval of your application was on its way. Again, congratulations! Finally, you will be reunited with your husband soon and start life anew with your family.