OK, bad news, Yes it does read the entire contents of the directory and make the zip files, this is awesome !!! However, if you re-run the script (say a few days later you have more tif files and you want to append those to the already existing zip) it clears the previous zip files contents and adds the new files. So if it includes:

123-34cv486.tif
234-34cv486.tif
[download]

and you go to add 345-34cv486.tif it wipes the zip file of the two previous files and then only contains the 345 file. Please help me monks, I want to be wise....