Residency start date for tax filing

I have a question regarding the residency start date. Here is my situation. I did not visit the US in 2022 or 2023. In 2024, I came to the US (K1 Visa) in March 2024. I got married (my spouse is a US citizen) and my green card in Aug 2024. 

 

For tax purposes, what is my residency start date if I file separately. 

 

I really appreciate any help. Thanks a lot in advance.