As signed content landed on https://mirror.stream.centos.org (and so third-party/public mirrors too) , I implemented the needed changes at the https://cbs.centos.org side (tested before so just waiting for publicly available content) to support c10s (https://pagure.io/centos-infra/issue/1406)
So you can now (as usual) create infra ticket (https://pagure.io/centos-infra/issues) to request tags for your SIG[s].
We tested the build+sign+push workflow for infra tag, and it worked fine, and got initial feedback from Storage SIG (https://pagure.io/centos-infra/issue/1360) for one test pkg and it worked too (so content is available through buildlogs.centos.org for testing and mirror.stream.centos.org for release tags)
Worth knowing that SIGs depending on EPEL will have to wait, or rebuild themselves needed dependencies, as EPEL10 doesn't exist (yet).
Happy building and testing against/for CentOS Stream 10 !