[ksk-rollover] What KSK rollover methodology will be used today?

Hey, everyone Does anyone know what is the method for changing the KSK rollover today? I have tried to look for it in ICNN documents but I unfortunately I could not find it.Also I would appreciate it if someone can send a link for ZSK/KSK rollover future timeline for root zone. Best wishes, Suhayb Alghutaymil