You can use simple SQLPlus query to find the version of Oracle E-Business Suite. Recently the latest Oracle EBS version R12.2.10 has been released to download as a patch.
If you are planning for EBS Oracle Applications upgrade and patching, then you must check version of Oracle Apps R12 before upgrade.
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Query to Check Version of Oracle Apps R12 E-Business Suite
Login as apps user and execute the below query: SQL> SELECT RELEASE_NAME FROM FND_PRODUCT_GROUPS; RELEASE_NAME 12.2.9 If you are login using sys, you can use below query: SQL> select release_name from apps.fnd_product_groups; RELEASE_NAME 12.2.9
Conclusion: You can find EBS Oracle Apps R12 Version by querying on fnd_product_groups table.