Redshift is missing in target database list of AWS SCT Schema Convertion Tool
OK, Amazon Redshift is only valid as a target database when you select OLAP or dataware house project option. If the project is created for an OLTP database Redshift is not an option as a target data platform.
Please refer to https://docs.aws.amazon.com/SchemaConversionTool/latest/userguide/CHAP_Welcome.html for detailed list