Unfortunately there isn't really a standard delivery time at the moment while they clear the order backlog. I ordered early May and still waiting. It depends on your config, how many people are in the queue ahead of you with that spec, what cars are on the ships arriving and whether you consulted your lucky 8 ball that morning.
I did get a call a couple of week's back giving me 2 day's notice of my delivery appointment which was completely out of the blue (it was cancelled the next day but that's another story). So they're not joking when they say you will suddenly get a call/ text, but don't expect much warning.