回複：隨140報的推薦信若幹封, 體檢表等, 擔保書等等, 你律師

since your I140 is LC based, 推薦信 is not needed.
you have all documents in your side, do 體檢 at once.

For I140, need your company financial document.
then your boss's signature.
Talk to your company ASAP.

It can be as fast as one week, or slow as many months