https://www.macrumors.com/2018/10/17/iphone...-release-dates/
Availability information:
iPhone XR will be available in Israel beginning Thursday, November 1.
iPhone XR will be available in Armenia, Bhutan, Brunei, Cambodia, Georgia, Kazakhstan, South Korea, Macau, Maldives, Myanmar, Ukraine, and Vietnam beginning Friday, November 2.
iPhone XS and iPhone XS Max pre-orders begin Friday, October 19 at 12:01 a.m. Pacific Time, with availability beginning Friday, October 26 at 8:00 a.m. local time, in Chile, Colombia, Malaysia, and Thailand.
iPhone XS and iPhone XS Max will be available in South Korea and more than 10 additional countries on Friday, November 2.

Xs Max - Battery drain from 79% charged  last night was bad - 7% after 8 hours. It was zero % from 100% charged the previous night
This behavior similar to ip8+
Standby drain an unimportant issue as this is not my main phone
Unable to check battery usage in ios12 - shown screen on figure is accumulated?

Thing is Apple didn't intend for Screen On Time to be a battery management feature, it's more for your personal screen time management.