@Override
        public Instant getEventTimestamp(
                DataCollectionId source, OffsetContext offset, Object key, Struct value) {
            if (value == null) {
                return null;
            }
            final Struct sourceInfo = value.getStruct(Envelope.FieldName.SOURCE);
            if (source == null) {
                return null;
            }
            final Long timestamp = sourceInfo.getInt64(SourceInfo.TIMESTAMP_KEY);
            return timestamp == null ? null : Instant.ofEpochMilli(timestamp);
        }
Copied from debezium for accessing here.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/oracle-cdc/src/main/java/org/apache/inlong/sort/cdc/oracle/source/reader/fetch/OracleSourceFetchTaskContext.java