As the title states, I am beginning to explore the possibility of an update letter. The letter would contain a high authorship on a poster presented (by the first author) at an international conference and a large grant won by my charity. I worry that, since I was an early submitter, I don’t have that much time to add updates before the Rs start really rolling in - but I also have a low authorship paper being submitted (post revision) in the next week or two. Should I wait?