You can wait until you get home to do it, but double check day-to-day that all your pictures are showing up in your account. We've had them not show up a time or two. In our case, it was because we had forgotten to scan our photopass card that we were using through Galaxy's Edge (they have a specific "data card" for the area, so I wanted to use that as a souvenir).
You'll have 45 days to download them. 45 days from your first day or your last day, I have no idea... we never wait that long
I think it's from date the photo was taken. So photos will drop off your account one day at a time not all at once. We went Aug 16 to the 22 and I noticed that's how it happened for me, my earlier park photos disappearing first.
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