Not everywhere, as others in this thread have mentioned. As a frequent traveler I'll be probably holding onto the last physical sim iPhone for many years until everywhere I travel to has it all ironed out.
There are a ton of websites where you can immediately get esims for almost every country, why bother with physical sims?
I’ve probably used their sims in 30+ countries at this point, they’re even available in more exotic places like St Barthelemy or Moldova.