It landed at Belp (south of Bern) at 13.16 hrs. on 7 May 1945. There were five people aboard.
Source: Karl Ries,
Deutsche Luftwaffe über der Schweiz (1978)
Ries doesn't mention the Grand Mufti in connection with DL+NT and Wikipedia says that "After the end of the Second World War, al-Husseini attempted to obtain asylum in Switzerland but his request was refused. He was taken into custody at Constanz by the French occupying troops on 5 May 1945..."
It look like that 5 May date is wrong since
a newspaper report with a dateline of 7 May says he arrived "this afternoon."
Another report refers to "on Monday" and the 7th was a Monday.