Delay in 189 grant

Hello there, I have lodged my Visa application on date 19/11/2022 along with my spouse as dependent applicant. My individual score was 70. I have applied for ANZSCO code 233311 ( electrical engineer). At the time of application my wife was 5 months pregnant. Our medical was done on date 23/11/2022. After that our daughter born and her application as second dependent applicant made on 28/4/2023 and her medical done on 13/5/2023. Till today my status is showing as “Received”. And no any update. Why there is delay in grant.? ( Our application is being processed by MARA agent).