Hi,
Currently, the guild quest lists the number of guild members needed to complete the quest ("Have at least xx of your guild members complete their own guild quests"). However, there is no way of telling who has completed theirs, or who hasn't.
It would be useful if members - or at least the guild owner and senior members - could view a list of members that have completed their individual quest. This would allow the guild member to encourage those members to complete it, and ultimately give the guild owner more information about how active a guild member is.
There is already a tab within the "Guild" icon that lists the members, their level, and their rank. Perhaps an extra column could be added named "Current Guild Quest Status", or even just a small column named "GQ" with a tick for those that have completed it, and a cross for those in progress.