Opening Word document…
It indicates futurity.
Webster ‘9 [Merriam-Webster; carbon dated to April 22; Online English-language dictionary; Merriam-Webster, “should auxiliary verb,” https://www.merriam-webster.com/dictionary/should]
3 used in auxiliary function to express futurity from a point of view in the past
realized that she should have to do most of her farm work before sunrise—Ellen Glasgow
4 used in auxiliary function to express what is probable or expected
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