-Not need I-485 anymore. They has been the green card holders from the date they entered US using the immigrant visa. Did you pay the immigrant fee yet? If no, you need to pay it so that USCIS will send the plastic green card to your parents. See these two links carefully for immigrant fee payment:
https://www.uscis.gov/file-online/uscis-immigrant-fee
https://www.uscis.gov/file-online/immigrant-fee-payment-tips-finding-your-number-and-dos-case-id
這時候是不是還沒有alien號碼啊?
-The A# should be found on the immigrant visa stamp or from the handouts the US Consulate gave to your parents.
這個綠卡的審批時間大約是多長啊?不知道是不是應該在登錄前就申請綠卡,所以有點著急。