The honeywell timer does not require to be grounded.
For the receptacle i would loop the ground wire from the "cable from source" around the screw in the box and then connect it to the receptacle.
All other grounds would go to individual screws on the box. (no screw would have more than one ground wire bound to it)
There is not much space in the box and would like to forego using a wire nut(s) if possible.
note: There are 8 screws in total in the 4 gang box.
Can i wire all the grounds to the screws as in the picture below? Would that be code in Canada?