"Peak/Prime Time" is usually considered at 9pm mark for each of these primary timezones. From that you can estimate what early/late means and adjust accordingly.
NA Secondary Timezone
Canada*, Mexico*, United States*
NA Primary Timezone
Bahamas, Canada*, Haiti, United States*
EU Primary Timezone
Albania, Andorra, Austria, Belgium, Bosnia and Herzegovina, Croatia, Czech Republic, Denmark, France, Germany, Gibraltar, Hungary, Italy, Kosovo, Liechtenstein, Luxembourg, Malta, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, San Marino, Slovakia, Slovenia, Spain, Sweden, Switzerland, Vatican
SEA Primary Timezone
Australia*, Brunei, China, Hong Kong, Indonesia*, Macau, Malaysia, Mongolia, Philippines, Russia*, Singapore, Taiwan
* Only certain regions, click the clock for full list.