I submitted an i485 aos request based on an underlying EB1-A i140 approval on Feb 15 2020. But I was able to port the Priority date (March 2015) from an earlier eb2 application.
Will I be ahead or behind someone who has a later EB1 india Priority date (say Jan 2018) that recently became current, but has an earlier submission date (say February 2018)
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source https://www.reddit.com/r/immigration/comments/ii884i/how_does_uscis_prioritize_priority_date_of/