while filing MFS usually costs more in combined taxes than MFJ what you need for MFS is his Social Security Number and also, both must determine whether to use the standard deduction or itemize. MFS may result in the loss of some tax credits.
I'll point out that if you lived apart from your spouse for the last 6 months of 2023 and you paid more than 1/2 the costs of maintaining a household for yourself and a qualifying child that lived with you for more than 6 months the proper filing status is Head of Household. you need no info from him for this filing status
