Kinda yes kinda no? Most PWAs have some idea of offline support but it tends to be an afterthought. The argument of local first is that you design the app to work against a local database ( normally stashed in indexeddb or OPFS ) meaning that you don’t have to wait for data to load or network requests to complete. Your backend is then just a dumb storage engine which accepts changes and sends push messages to the client to indicate things have changed.

The only “big” local first app I’m aware of is Linear.