英文文法問題 - Our branch already created Whatsapp group. 正確嗎?

是正確的
We have already created ...
或是
We already created ...
都是可以的

The present perfect tense :-"has already" indicates completion while "Just" indicates the immediate past .They denote actions that are completed recently.
Hence:- Our branch "has" already created Whatsapp group.