Photo Compression In Photoshop CC

Tiff has several compression options Jpeg has a  quality setting and uses a compression that looses some image quality every to you Save a new generation some quality is lost  the lower the quality setting is, the grater the loss is.  You can save hundreds of time during an edit session. You are always saving just the same next generation. You are not accumulating image loss with each save.  Its the sequence  Decode Encode that generated the next generation.   So the sequence decode,  encode, encode, encode, encode, encode, encode, encode, encode all the save  encodes are from a singe decoded source,  All the save are from the same file decoded generation but the saves can be save with qualities. So the saved files can have a different amount of quality loss because of the quality setting used during save

You can open and do a save as, where you will see the current quality level for a file previously saved by Photoshop, then you can hit cancel so as not to overwrite an existing file (i.e. JPEG).

Otherwise I'd use the CLI based ExifTool.