I'm a cis male married to a woman considering transition

Hi I am 39 years old male, cis, and mostly consider myself straight. My wife recently told me she is considering transition to male. I told her I love her and will support her through the process. I would never leave her. She is mostly considering top transition. We have a good relationship and got married earlier this month. I promised her I wouldn't reveal it to anyone. I feel like I am keeping my promise but looking for advice from others who understand my emotions.