In early sobriety i used to write down my entire daily schedule, literally hour by hour so I always had something planned instead of drinking. I'm still pretty anal about keeping a detailed electronic schedule but not quite to that extent.
To me what's most important is making sure time is spend every day on your recovery, whatever method you use. If you are in a meeting based recovery program it's a lot easier because the meetings are already set, the steps are already written and you probably have a sponsor. If you are doing a self-based program like AVRT, or just using SR you are responsible for making sure that you do the work. If you need to write it down to make sure you do it, then absolutely do so.