Update progress info and start welcome info (#3768)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] Refactoring

---------

Signed-off-by: jinhai <haijin.chn@gmail.com>

rag/app/qa.py

@@ -73,7 +73,7 @@ class Pdf(PdfParser):
     def __call__(self, filename, binary=None, from_page=0,
                  to_page=100000, zoomin=3, callback=None):
         start = timer()
-        callback(msg="OCR is running...")
+        callback(msg="OCR started")
         self.__images__(
             filename if not binary else binary,
             zoomin,
@@ -81,15 +81,19 @@ class Pdf(PdfParser):
             to_page,
             callback
         )
-        callback(msg="OCR finished")
-        logging.debug("OCR({}~{}): {}".format(from_page, to_page, timer() - start))
+        callback(msg="OCR finished ({:.2f}s)".format(timer() - start))
+        logging.debug("OCR({}~{}): {:.2f}s".format(from_page, to_page, timer() - start))
         start = timer()
         self._layouts_rec(zoomin, drop=False)
-        callback(0.63, "Layout analysis finished.")
+        callback(0.63, "Layout analysis ({:.2f}s)".format(timer() - start))
+
+        start = timer()
         self._table_transformer_job(zoomin)
-        callback(0.65, "Table analysis finished.")
+        callback(0.65, "Table analysis ({:.2f}s)".format(timer() - start))
+
+        start = timer()
         self._text_merge()
-        callback(0.67, "Text merging finished")
+        callback(0.67, "Text merged ({:.2f}s)".format(timer() - start))
         tbls = self._extract_table_figure(True, zoomin, True, True)
         #self._naive_vertical_merge()
         # self._concat_downward()
@@ -226,7 +230,7 @@ class Docx(DocxParser):
             sum_question = '\n'.join(question_stack)
             if sum_question:
                 qai_list.append((sum_question, last_answer, last_image))
-                
+
         tbls = []
         for tb in self.doc.tables:
             html= "<table>"