I went on a Sun afternoon w/ no resv. & waited on 10 mins or so to get in, but the special exhibit was already filled up w/ resv for the day. But I really enjoyed everything else the museum had to offer. It was great!!
Going later might be less busy. When I went we reserved for 4pm and it wasn't busy, but be sure you reserve for the exhibit inside too or you won't get in.
If you meant that if you go on Wednesday at 11:00 you won't have to wait in line, i suggest you to arrive earlier because both times i visited the museum, the line to enter (even with an online reservation) was very crowded.
Maybe you should get together soon and McLaren team
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