My personal experience... I read this thread a couple of times before our trip, but hadn't gotten in any practice. Nor did DH.
Our HS morning we got up (staying off property in a rental house) and started watching time.gov at 6:55. We were on the house's wifi. When it was down to the last 5 second we switched back to the app, counted down to 1 and hit join. We got BG 11! DH would have gotten through fine too but I clicked faster than him, so he stopped when mine was successful.
We were slightly disappointed that our BG was called at 8:30 (on a 9am opening) so we missed out on that precious first hour of shorter lines. We got into the park at about 8:45 and stopped for some photo pass pictures on your way to ride. It was amazing and we were wishing all day we could go again!
Editing to add this was 2 days ago. Wednesday the 31st.