The Current and Target % are not available in the OData feed at present. However, you can calculate them using the fields in the Users table.
Current % = UserLearningPlanSummary_CompletedComponentsCount / UserLearningPlanSummary_ComponentsCount
Target % = UserLearningPlanSummary_ExpectedLearningPlanProgress/ UserLearningPlanSummary_ComponentsCount