You have to create simulator build in your eas.json file like :

"development-simulator": {
  "developmentClient": true,
  "distribution": "internal",
  "ios": {
    "simulator": true // The important part!!
  }
},

Then you need to run your build, when it's finished expo will ask Install and run the iOS build on a simulator? then select Y and app will be installed on your simulator. Cheers :)