Reports claim that the M1 successor has already entered mass production at TSMC on the N5P nodes and shipments are to be expected some time in July. The new "M2" processors could first be introduced with the 14-inch / 16-inch redesigned MacBook Pro models and 27-inch iMacs launching this fall.
https://www.notebookcheck.net/Apple-M2-processors-reportedly-enter-mass-production-shipments-scheduled-for-July.535905.0.html