You have posted to a user-to-user site, so we are all users here......just like you. Apple is not here. They will not see your post or reply.
As users.....just like you.....we do not have access to any of Apple's sales or delivery systems, so you should not expect an exact answer from anyone on this site. All that we can do is tell you what our experience in the past has been.
You should expect your order to be "processing" for awhile. This means that a product is not yet available in projected inventory to honor your order.
You will receive updates from Apple that give you a timeframe in which your iPhone will ship. Those dates are usually very accurate. Then, you will be notified when your iPhone has been shipped and your credit card has been charged.
We cannot tell you how exactly Apple allocates orders, but it would probably be fair to say that it is basically "first come, first served".
In other words, if you are hoping to receive your iPhone earlier than the projected date, that is very unlikely to happen.