Yes and no...
I spent a decade or so, competing at international level in target rifle (as an amateur). Peak performance requires training at fairly high intensity, so you can't keep it up continuously. You also need downtime, and time to bed in any changes to your technique. So; you run long-duration training "macrocycles" around the year, or even Games cycle; short-duration training "microcycIes" to look at performance issues that are day-to day stuff; and mid-duration "mesocycles" that address month-to-month stuff. Everyone trains slightly differently; I was more flexible at planning around "this needs some extra work" (I emphasised microcycles), my pairs partner was more rigid in his "but my month's plan says this" (he emphasised mesocycles). His approach wouldn't work for me, nor mine for him.
I knew that I could "peak" two or three times a year; working to have stable technique, trialled at buildup matches, bedded in and reinforced as you work to the big (predictable) events - at my level, British championships, an international match you hoped to be selected for, etc.
Anyway, the important bit. The "top of your game" isn't just about absolute performance - it's about repeatability. It is absolutely dependent on that background of ongoing training; you can't just hammer it for a couple of weeks beforehand, and cuff it on the day. Everyone remembers the time when they pull an amazing score out of the bag "on the day", everyone forgets all the times that it just didn't work.
That "top of your game" is bringing up the standard of your worst matches to near your best, so that you have confidence that if anything goes differently from planned wrong (say you can feel you're going down with an illness, or you didn't sleep well, or you're worried about the wife's health) you can still graft out a decent score. Been there, done that - big competition, four days after a Scottish pairs record, I started to go down - discussed it with coach, changed the match plan, shot like a donkey, got drugs tested after the match, the Doctor said "they gave you what?" when I declared the broad-spectrum antibiotic that the team medic had handed me.
I was "in the zone" on two occasions when I equalled the British record; once as a bit of a novice, in perfect conditions, everything going well. The second time as I was recovering from viral conjunctivitis, hadn't trained for three weeks, didn't know whether my eyes were going to turn into sandpaper after quarter of an hour, trying out a new variation on my prone position that really f***ing hurt; so I rushed the whole sixty-shot match in under half an hour, finished in agony. Both performances needed that solid foundation of good training.