Hi ,
There is a small mistake about this document : https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...
Performing MX Templates Firmware Upgrades
Firmware upgrades scheduled on the template will automatically be applied to the child networks’ network local timezone.
As a best practice, make sure that each MX has the correct local time zone configuration under Security & SD-WAN > Configure > General.
This should mention Network-Wide -> Configure -> General.