This seems unlikely for the foreseeable future. The regulator does not currently seem to have any plans to do this. Each responsible party will have to assess whether a country does have adequate protection and record their decision. This is very important because if a country does have adequate protection, personal information can flow from South Africa to that country without the responsible party having to take extra steps.
Will the EU be regarded as having adequate laws considering it does not protect juristic persons? No. Strictly speaking, the GDPR does not “provide an adequate level of protection that effectively upholds principles for reasonable processing of the information that are substantially similar to the conditions for the lawful processing of personal information relating to a data subject who is a natural person and, where applicable, a juristic person” (section 72).