Not at all times..

If the officer or any CSR issues a receipt it doesnt mean that your document was complete or your application if fulfilled.

Just an expereience, I applied for a family visit visa at Mesaimmer Immigration and it was the highest officer who signed for it and ask the guy on his right side to issue the receipt and he said to check within 2-3 days online. I checked it but it was saying "Application is under process" it was like that for more than a week. then I check it again it was saying now "Sorry No data for this application" Then I decided to go back, I went to the same person who signed my application and he said "ITS READY, NO PROBLEM". Then he print and handover to me.

Second experience, I applied for a Kadama Visa in Wakra Immigration. Not me as the sponsor but my Qatari friend. I believe all documents are there. And Mr. Al Ansari checked and sign the document. After several days I was wondering why the status is "Application is under process" (not exact words). Then I went to him and he said that I lacked the 2nd marriage certificate of my qatari friend thats why my process was still under processing. He asked me to bring the document to him and he will issue the visa in one hour. So I do so,.. and luckily he did his' part.

Tip: the most fast acting immigration office that I encounter was in Al Wakra for personal sponsorship, Mesaimeer for RP renewals and for company matters it will be in Industrial Area.