I've recently done a thread on the colour photographs that date to 1 June, which you can read here. Unfortunately Princess Maud doesn't appear in the Force O embarkation orders I have (which date to 19 May), so I presume she was a later addition. From the shadows, we can deduce these pictures were taken at about 2pm, but 2 June was a full day of troop loading at the pier, so unless Princess Maud was shoehorned in, I doubt it was then. In the Eastern Task Force, stores were loaded in the days before the troop embarkation to avoid congestion, which is why I'm more inclined to think it's very late May, before full embarkation began on 1 June. I haven't been able to find thes epictures in US archives so far(not that they're usually dated particularly accurately!).