I’ve seen other reports saying it is set 7 years before RotJ and another saying it’s set 7 years after the battle of Yavin.
The interview with Jon Favreau, of which many of the reports are likely based on, can be found here mate:-
https://nerdist.com/jon-favreau-star-wars-tv-series-details-exclusive-nerdist-news/
^ Jon Favreau starts talking about it 1 minute into the video.
(Favreau says it takes place around 7 years after the Battle Of Yavin)