mods, is it possible to post my response on the other side here?
Interesting question.
I don’t see why it shouldn’t be said. You say maybe “we havent started saying it”, and we haven’t, in practice, but theoretically when we begin saying it is on shabbos already.
Additionally, that s’vara is probably only used as to when to be m’sakein the time for beginning, but once the date was fixed as the 61st day, it wouldn’t be changed because no one said it yet. (ex. If you know that everyone else forgot to say it, you would still say it.)