Hi, I am in my last month of my OPT and I got married with US citizen on April this year, we are still preparing to file the adjustment package, but I want to keep working while we filing this package, can I file I-785 first before I file the adjustment package? if not, what should I do? Thanks

You probably mean the I-765 (application for an EAD). You can only apply for it at the same time as, or after, filing the I-485 (application for adjustment of status). Also, it takes about 3 months to get, so you will probably have a period without employment authorization.