Yes, there are quite a few teams that will benefit from this postponement, the teams in blistering form wouldn't be happy, they'd have loved to play and continue performing at their highest level, but for the clubs that are struggling, this prolly gives them more time to analyse what's gone wrong for them and try to rediscover their form; like you said, one of such teams is Chelsea, and of course they now have a new manager, he'd (Graham Potter) be happy he's not been thrown right into action as he should have against Fulham in the Lunch time kickoff tomorrow, but he now has more days and even weeks (as there is no official statement as to when the EPL will return) to get to know his team more and pick his best players.
~
Theoretically, now all English teams playing in European competition will benefit from being able to concentrate on them. But then the postponed games will have to be played, and given the fact that the calendar is already very tight due to the World Cup, this will be a disaster for some teams (those with not very deep lineups and those with injured players).