Solaris 11 was available in 2011.
Current version of solaris is 11.4 is announce to be supported until 2034, but no new version is planned

Oracle stopped SPARC M8 and SuperCluster shipment in 2019.

Fujitsu announce the end of sales of SPARC in 2029

https://www.fujitsu.com/global/products/computing/servers/unix/sparc/key-reports/roadmap/