There must be something wrong with the trucks were 'built' around that time, mine is on 8/30 and is also not shipped yet. But so many trucks built after that time period got shipped already.
I have a pretty similar timeline to OP : got VIN in April, initial production date in June then several push backs until 8/30 showing built. Right now, it is still not shipped yet.....
frustrated to see someone got built date later than me but will get the trucker earlier...