code: protected void progress(double pct, int blocksSoFar, Date date) {
          log.info(String.format(Locale.US, "Chain download %d%% done with %d blocks to go, block date %s", (int) pct, blocksSoFar,
                  Utils.dateTimeFormat(date)));
      }
docs: Called when download progress is made.
  
  @param pct  the percentage of chain downloaded, estimated
  @param date the date of the last block downloaded