Times shown as a number of minutes are real time of arrival based on live data from the buses otherwise you are seeing timetable times which are less reliable.
These are times for the stop opposite the Waggon and Horses in High Street (not Ely Road). The 9 and Citi 2 services depart from here which takes you into the centre of Cambridge.
The stop has a brick built bus shelter however drivers can’t see you if you’re in the shelter so make sure someone stands on the pavement to flag the bus down.