public static com.google.cloud.texttospeech.v1.SynthesizeLongAudioMetadata parseFrom(
      com.google.protobuf.CodedInputStream input) throws java.io.IOException {
    return com.google.protobuf.GeneratedMessageV3.parseWithIOException(PARSER, input);
  }
<pre>
The progress of the most recent processing update in percentage, ie. 70.0%.
</pre>

<code>double progress_percentage = 3;</code>

@return The progressPercentage.
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/SynthesizeLongAudioMetadata.java