I was able to use the below query to show the size of all the datamodels which are accelerated.
|rest servicesNS/-/-/data/models
| search acceleration="1"
| table title eai:appName eai:userName
| rename eai:appName AS name| eval myDatamodel="DM_" . name . "_" . title
|map search="|rest /servicesNS/nobody/-/admin/summarization/tstats:$myDatamodel$ splunk_server=local"|table eai:acl.app,eai:acl.owner, summary.id, summary.size|rename eai:acl.app as app eai:acl.owner as owner summary.size as size summary.id as datamodel|eval sizeMB=round(size/1000000,2)|fields - size|addcoltotals sizeMB
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