I'd wait till a proper holiday sale, but do I remember buying a Wii U during a Christmas in July sale at Best Buy because I had a 50 dollar gift card I had no idea what to spend on. So I just walked and got one. I have zero regrets (the Wii U just had Tropical Freeze come out for reference).
Sometimes if the mood is right, do it. Waiting too long also backfires. Ok to correct my wishy washy answer (live edit). The Switch 2 doesn't have a lot of games at the moment, and I am not sure how stable these first runs are, I don't think they are going to fail. People just complain they have no games and the keycards from what I saw. The Switch 2 seems to run a lot of Switch 1 games better.
Today's the same as ever.