While the first 3 nm chips from big companies like Apple could launch in late 2023, obscure companies like MicroBT already offer 3 nm technology to cryptominers for a substantial premium. MicroBT's M56S++ model was recently discovered to feature ASICs produced on Samsung's first gen 3 nm nodes with gate-all-around transistor design.https://www.notebookcheck.net/Samsung-s-upcoming-3-nm-gate-all-around-chips-discovered-inside-cryptomining-rigs.735210.0.html
The apple chips will be manufactured by Samsung.