Director James Gunn has confirmed that the events of Thor: Love and Thunder will take place prior to those of Guardians of the Galaxy Vol. 3 in the MCU timeline.
The filmmaker posted a congratulatory message on Instagram, commending the entire team behind Avengers: Endgame for surpassing Avatar’s $2.79 billion box office earnings to become the highest-grossing movie of all time. The comments section was largely flooded with similar celebratory sentiments, however, one fan took the opportunity to ask whether Thor 4 would take place before or after Guardians 3, and Gunn simply replied, “Before.”
Source: IGN.com James Gunn Confirms Thor 4 Is Set Prior to Guardians of the Galaxy 3