Quality & grading will be communicated to you by the embryologist on the day of transfer.
For KKH, unless you specify to your doc that you want D5 embryos to be transferred, you will be invited back to KKH to transfer D2 embryos, but of course the doc will ask you if you would like to come back again for D3/D4/D5 embryos (provided they make it).
For my case, though I had communicated to my doc that I want my frozen embryos to be blasted (D5), on one day earlier, the nurses summoned me back for an ëmergency" D4 transfer as the embryologist was not confident that they would make it to the next day.