Change last name while 485 is pending

[changenameafter485]

Hello experts,

I got married and applied my 485 with my maiden last name. My 485 is pending.

1) What is the procedure to change my last name to my husband's last name while my 485 is pending?

2) Is it better to wait until my 485 is approved and green card is received? If yes, what is the procedure after getting green card?

Thanks