As of right now those ETFs have to buy about $600M of Bitcoin before the tradfi markets open at 930am EST on Monday. And I know those dudes don't work weekends. 

They have been coming it at like 6am to buy the needed BTC every weekday for 3 weeks now.

You can see them in a 1HR chart almost every single day. If there was a positive net inflow to the ETFs the next morning around 6am EST the pricing bounces a bit when they place the orders.

Every morning like clockwork https://image.nostr.build/875d5e00468124f1fe76a3daaec88bb516071063696183bfcb99fce0af4afe82.jpg