Update multiple records using dapper after select by uniqueidentifier

I have number of records that I have loaded from database and I want to update set couple values before I return them. The only main requirement I do not want multiple commands updating each record one by one.

Please note my ids are GUIDs(uniqueidentifier)

so far I have my code as

public IEnumerable<Person> GetUnprocessedPeople(int batchSize)
    {
        List<Queue_ImportQueue> list;
        using (IDbConnection db = OpenedConnection)
        {
            string peopleList = $"SELECT TOP({batchSize}) * FROM [dbo].[Person]";

            list = db.Query<Person>(peopleList).ToList();
            using (IDbTransaction transactionScope = db.BeginTransaction(IsolationLevel.Serializable))
            {
                string updateQuery = $"UPDATE [dbo].[Person] SET Created = GETDATE() WHERE Id ='@ids'";

                try
                {
                    db.Execute(updateQuery, new { Id = list.Select(x => x.Id) }, transactionScope);
                    transactionScope.Commit();
                }
                catch (Exception ex)
                {
                    transactionScope.Rollback();
                    throw;
                }
            }
        }
        return list;
    }