So, my client surprised me with this today:   " I got married November 2022. we are currently in the petition and immigration process. I do not expect my spouse to arrive until 2025."

This is not an area I am familiar with so I am not quite sure where to even start.  He filed Single last year.  Should he be filing MFS?  I am not sure what questions to ask to determine status.

thanks for any advice you can provide.