Standard SOP in an incapacitation is for the other pilot to land the aircraft and, if necessary, to ask a cabin crew member to read the checklist.....
There isn't really an SOP for this type of situation, in that it isn't really "Standard". There are certainly basic principals to be applied, but the nature of the emergency would dictate the methodology employed as in this case.
For this situation it might well have been appropriate, but generally speaking it isn't usually advisable to have anybody reading checklists, who is untrained or unfamiliar with the process. The remaining pilot is normally better able to refer to the checklist and to action it where applicable.
In this case good application of CRM though, where the crewmember had commercial pilot training.