Possibly, mate, possibly. It’s an easy trap to fall into.
And, yes, that’s a serious comment. When we retire, there’s an awful lot of hours to fill that used to be filled with working/commuting/etc. It can lead to inventing “stuff to do”. When I took early retirement, I got excellent advice from a colleague who had retired but had returned a couple of years later to do some temporary part-time work. She suggested not taking on new long term projects until some months after retirement. The danger being that you take on a lot to fill the time and then find you have difficulty putting them aside when life has slowed down in a few months.
However, here, it doesnt seem as though you’ve invented “stuff”, simply decided to undertake prep as a distinct and separate process from what you would usually have had to have done to prep for dinner. Personally, I’m happy to prep as an immediate prelude to cooking.
Now, if you need to fill some time in the run-up to the festive season, how about taking up making preserves - jams, chutneys , pickles, etc. They can make lovely Xmas presents and, of course, are a delight to eat. I made my pickled onions at the end of September and, whilst I’ll try one in the next few days (in case something has gone wrong), they won’t really start to be eaten until with the pork pie on Boxing Day. Oh, and I still have a jar of the Seville orange marmalade I made early in the year.