Once the global option is used in an attibute, they're in the StringMapBase table. Before they're used, you can use the following query:
select os.Name, l.Label from AttributePicklistValueAsIfPublishedLogicalView av
join OptionSetAsIfPublishedLogicalView os
on av.OptionSetId = os.optionsetid
join LocalizedLabelAsIfPublishedLogicalView l
on l.ObjectId = av.AttributePicklistValueId
where os.IsGlobal = 1 and os.IsCustomOptionSet = 1
and l.ObjectColumnName = 'DisplayName'
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