I-485 Received date及處理順序 - 移民

依照USCIS官方說法，I-485是依照I-485申請文件的遞件先後順序來處理．但是對於I-140
以及I-485一起遞交的情況，I-485的Received date應該是跟I-140的Priority date同一
天（PD: 10/09/2019），還是要從I-140被正式批準的那天算起（PD: 04//08/2021）？

如果是前者，那我自己的I-485 已經是在TSC處理中心pending超過兩年了，目前還是一點
消息都沒有。但如果是後者，那感覺有點不公平而且可能等待的時間又更長了，遙遙無期
！

兩週前提交了第一次Service Request，收到的回覆依然是罐頭回覆：

We have received your service request and researched the status of your case.
We have had to perform additional review, and this has caused a delay in
processing time. Your case is currently in line for processing and
adjudication. Cases are processed in the order in which they were received.

想請問版主以及其他有過類似經歷的朋友，有沒有什麽見解及建議？ 謝謝！

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