If Arsenal win the competition then Spurs will start their Europa League journey in the second qualifying round, with a behind closed doors one-legged tie on September 17, with the Gunners going into the group stage.
However, if Chelsea win the FA Cup then as they are already in the Champions League, Spurs would go straight into the group stages of the Europa League, which begin on October 22, and it would be Wolves who enter in the second qualifying round.
https://www.football.london/tottenham-hotspur-fc/fixtures-results/tottenham-europa-league-round-lose-18666988