How can we ensure reliable and low-latency kafka writing using confluent-kafka-go client?

The sample producer code at https://github.com/confluentinc/confluent-kafka-go calls Producer.Produce(...) It writes the message to the sending buffer queue and return immediately. However, writing to the internal buffer queue does not guarantee successful message delivery. How can we ensure sucessful message delivery here?

for idx, word := range []string{"Welcome", "to", "the", 
                                "Confluent", "Kafka", "Golang", "client"} {
    start_time := time.Now().UnixNano()
    p.Produce(&kafka.Message{
        TopicPartition: kafka.TopicPartition{Topic: &topic, 
                                             Partition: kafka.PartitionAny},
        Value:          []byte(word),
    }, nil)
}