If you look at the timer, it's almost certainly planned Engine 1 cuts off 1m45s after launch Engine 2 cuts off 1m28s after engine 1 Engine 3 cuts off 1m28s a

If you look at the timer, it's almost certainly planned Engine 1 cuts off 1m45s after launch Engine 2 cuts off 1m28s after engine 1 Engine 3 cuts off 1m28s after engine 2 and then SN8 goes into glide testing. The extra time on all 3 engines is probably to gain sufficient height?