business premises visit by GST office

The registration is granted after due verification and within the 7 days.

So its clear Officer can visit in Business Premises within prescribed timelimit 

In Rule this lines mentioned

The proper officer may grant registration after due verification and issue a certificate of registration in FORM GST REG-06 within a period of three working days from the date of submission of the application. (3) Where, upon an enquiry or pursuant