@mfitt999 Yes, today only your PVP attempts will count towards the guild activity. Everyone gets the same "tier" reward, but it does provide more guild tokens to players who contributed more. You can view the rankings in the Guild Activities tab.
In terms of trying to coordinate Arena payouts with other members on your shard, there are various options. Most of them will use Discord (or sometimes Slack) to coordinate activities. Watch the players who are near the top at your payout, and try to send some of them a message to see if there's already a chat server, and ask if you can join it.
Alternatively, you can watch the movement of players in the 1-2 hours before and after your payouts, take notes or check their swgoh.gg profiles to see when their payouts are. Avoid anyone whose payout is coming up soon on your climb, and see if they will let you get as high as you can. Sometimes shard chats will reach out to you if you get high enough.