Learning targets make a ton of sense. Your students should definitely know what they are working on when they come to you. If you're building is already doing 'I can' statements it's an easy carryover to the speech room.
This speech therapy freebie is what I'm using to help student's focus on their speech and language goals.
Please use the documents for your own speech rooms!
Find some images here: http://speechroomnews.blogspot.com/2013/09/slp-101-learning-targets-with-freebie.html