The grassy Knoll/Hill outside the East stand gets the sunshine. I have seen a few people with full on picnics up there. If it is dry and you want to do it on the cheep that is a superb option. Downside, again, no outside bogs to empty the old bladder.
The turnstiles opened at one pm for the last 3pm Kick off (West Brom) so I guess Dicks will be open from about the same time. Turn up at one and you will have few issues getting Into dicks I would have thought.
Depending on the weather, if it is good then I’d start in Dicks for an hour or so...