18A - Current 35%, visible path to plan of record 60-65% by end of Q4'25. No large problems gating path to POR.
Going above 65% is unknown
14A is a derivative of 18A and has a better curve (yielding better than 18A at the same time in the development process from start)
At POR yields, good enough to break even for small die size products. Large products like DC CPU or GPU will require yields to be >85% to be feasible, preferably above 95%. However that probably will take a few more quarters to achieve.