About 40% of all Swiss inhabitants speak English at least once a week [1].
Anecdotally, I can't think of a single acquaintance younger than 50 years old that doesn't speak fluently. Everyone in Switzerland learns English at school for at least five years. Most even for seven years.
Some of my German speaking friends even talk in English to French speaking people, even when both have learned the other‘s respective language at school.
[1]: https://www.bfs.admin.ch/bfs/de/home/statistiken/bevoelkerun...