Here is the setup for my Apple M1 Pro:
$ rustup show
Default host: x86_64-apple-darwin
rustup home: /Users/bruno/.rustup
installed toolchains
--------------------
stable-aarch64-apple-darwin (default)
stable-x86_64-apple-darwin
nightly-2022-02-10-x86_64-apple-darwin
nightly-2022-02-19-x86_64-apple-darwin
nightly-2022-02-20-x86_64-apple-darwin
nightly-2022-03-14-x86_64-apple-darwin
nightly-2022-04-01-x86_64-apple-darwin
nightly-x86_64-apple-darwin
active toolchain
----------------
stable-aarch64-apple-darwin (default)
rustc 1.62.1 (e092d0b6b 2022-07-16)
$ rustup +nightly show
Default host: x86_64-apple-darwin
rustup home: /Users/bruno/.rustup
installed toolchains
--------------------
stable-aarch64-apple-darwin (default)
stable-x86_64-apple-darwin
nightly-2022-02-10-x86_64-apple-darwin
nightly-2022-02-19-x86_64-apple-darwin
nightly-2022-02-20-x86_64-apple-darwin
nightly-2022-03-14-x86_64-apple-darwin
nightly-2022-04-01-x86_64-apple-darwin
nightly-x86_64-apple-darwin
installed targets for active toolchain
--------------------------------------
wasm32-unknown-unknown
x86_64-apple-darwin
active toolchain
----------------
nightly-x86_64-apple-darwin (overridden by +toolchain on the command line)
rustc 1.64.0-nightly (62b272d25 2022-07-21)