So far, Apple's chips have used the following process nodes:
A14/M1 - N5
A15/M2 - N5P
A16 - N4, because TSMC's N3B node was not ready in time
TSMC's N3 nodes are now ready, and there are two nodes at play, N3B and N3E. Nothing I've read has been clear on which node will be used for the M3...