Facebook has a slight delay from when a donation is made to when it is available to view in the Facebook transaction data. Typically this is as follows:
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Facebook Multi-Day Transaction Reports
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On any given day you can usually request a Facebook multi-day transaction report from Facebook for the day before.
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The best way to think about this is if a fundraiser/donation happens on a Monday, you can get the data on Tuesday. If they happen on a Tuesday you can get the data on a Wednesday, and so on.
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Facebook Data Importer (Single Day Importer)
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With the Facebook Data Importer, there is usually a one-day delay in Facebook making the data available.
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This means if a fundraiser/donation happens on a Monday, you would be able to import this data using the Facebook Data Importer on Tuesday.