To review the status of the active scan, try one of the following commands. It will output the percentage of completeness as a status value. Depending on the output format you need, you may change JSON to HTML:

$ curl  "http://localhost:8090/JSON/ascan/view/status/"

The following command will generate the active scan status in JSON format:

$ curl  "http://localhost:8090/JSON/ascan/view/status/?zapapiformat=JSON&formMethod=GET&scanId="