$ ${SOLR_ROOT}/bin/solr status
Here's the output of running this command on my localhost where I have 2 Solr instances and 1 ZooKeeper instance.

Found 1 Solr nodes: Solr process 11369 running on port 8983 { "solr_home": "/opt/solr-i1/server/solr", "version":"8.6.0 384dadd9141cec3f848d8c416315dc2384749814 - mdrob - 2020-05-19 13:23:17", "startTime": "2020-05-20T01:08:42.981Z", "uptime": "0 days, 0 hours, 11 minutes, 2 seconds", "memory": "290.7 MB (%56.8) of 512 MB", "cloud": { "ZooKeeper": "localhost:2181/solr", "liveNodes": "2", "collections": "1" } }