Assuming we are now set at WR, I expect we'll see Callaway as the third unless Harty is in to help blow the top off of the D ( I've said it before, I can't wait to see Harty and Olave run deep crossing routes with AK41 and CGM underneath). We'll probably also see him in certain sets where the Saints want to utilize his blocking skills or in 4 WR sets.
So, I think he'll get used plenty, but CGM and Olave are going to be our 1 & 2.
TQS and one of the other guys will be situational.