Add is_last_batch to progress tracking

[carmocca]

What does this PR do?

Required for #9563

Minor docstring fixes are included

Does your PR introduce any breaking changes? If yes, please list them.

None

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[codecov]

Codecov Report

Merging #9657 (800ab6b) into master (ca5459e) will increase coverage by 0%.
The diff coverage is 100%.

❗ Current head 800ab6b differs from pull request most recent head fdb868b. Consider uploading reports for the commit fdb868b to get more accurate results

@@          Coverage Diff           @@
##           master   #9657   +/-   ##
======================================
  Coverage      93%     93%           
======================================
  Files         179     179           
  Lines       15324   15313   -11     
======================================
- Hits        14216   14207    -9     
+ Misses       1108    1106    -2