It's not a matter of how much daylight is still there, it's more a matter of what time it is: if it's animal-dinner-time, the animals will be out there. Though there are animals visible most times of day, there are a lot of times when you see few animals. We ate dinner at Sanaa in late May, when the sun didn't go down until almost 9:00 PM. But we were told the animals are kept on as "natural" a feeding schedule as the keepers can manage, balanced with the idea that some viewing time would be helpful for the hotel guests. So when we ate at Sanaa, the animals were on the savannah right outside the restaurant windows eating at around 5:30-6:00 p.m. They pretty much disappeared between 6 & 6:30 p.m.
We were told that some of their fodder is put outside the restaurant windows area at around 5:30 because that is a normal eating time for the animals--late afternoon/early evening--before getting settled in for the night elsewhere...and people can see them while they're eating. Then the animals go to a more secure area for the night, so the keepers put the main feed for the night in the secure part...which is why they leave the area. The herds know where the next "course" of the meal is..basically they eat what's out for them & then wander off to where the next food is...in this way the keepers get the animals to move to where they should be next. This is what we were told, anyway. I do know that there were a lot of animals out there at 5:30, but by 6:30 they were virtually all gone...maybe one or two lingered a bit but the bigger part of the herd "disappeared."
So, if you really want to see the animals & get the chance at a window seat, I'd book the first seating (was 5:30 PM when we went)
To get there from Pop, you'll have to either take a cab (which would be fastest method), or take a bus to a Park & then switch busses at the park to the Animal Kingdom bus. Your fastest route would probably be to take the first park bus that arrives at Pop instead of waiting for a specific park bus. Don't take the Downtown Disney bus, though...those are very slow routes & can take forever to get anywhere.