Create a script to check a checkbox

Since the value for all the affected fields is being changed to the same thing, it would be most convenient to change the values of a whole View at a time.

Create a view that filters records to ones where “Roadmap-visible” is one of the selections.

Then make your script:

let table = base.getTable("Table Name");
let view = table.getView("View Name");
let query = await view.selectRecordsAsync({fields: []})

let updates = query.records.map(r => {
  return {id: r.id, fields: {"Checkbox": true}}
})

while (updates.length > 0) {
  await table.updateRecordsAsync(updates.slice(0, 50))
  updates = updates.slice(50)
}