Yeah, " This Berry distribution runs from January 7, 2019 (8:00 p.m. PST), to September 2, 2019 (4:59 p.m. PST), so don't miss out on adding these valuable items to your game! "
PST now: 10:47 am
As per any other PGL event, probably all goes online at the same time.
edit source: https://www.pokemon.com/us/pokemon-news/get-rare-berries/