Looking for help migrating packages to Meteor 3.0

Here’s our current use case and let me know how you’d handle it:

We use a (reactive) AutoForm form where a user can be assigned to an organization based on a certain criteria.

allowedValues() {
            // we don't want to show ourselves and no other satellite pharmacies.
            const query = { isSatelliteOf: { $exists: false } }
            if (Meteor.isClient && getCurrentlyEditedInstitutionId())
               query._id = { $ne: getCurrentlyEditedInstitutionId() }

            return _.map(
               Collections.Institutions.find(query, {
                  sort: { name: 1 },
                  fields: { _id: true }
               }).fetch(),
               "_id"
            )
         },
         autoform: {
            options() {
               // we don't want to show ourselves and no other satellite pharmacies.
               const query = { isSatelliteOf: { $exists: false } }
               if (Meteor.isClient && getCurrentlyEditedInstitutionId())
                  query._id = { $ne: getCurrentlyEditedInstitutionId() }

               return _.map(
                  Collections.Institutions.find(query, {
                     sort: { name: 1 },
                     fields: { _id: 1, name: 1 }
                  }).fetch(),
                  (institution) => {
                     return {
                        label: institution.name,
                        value: institution._id
                     }
                  }
               )
            }
         }```