As a virtual assistant providing real-time grammar correction and suggestions, review the following text and provide appropriate corrections and suggestions:

"Dear Mr. Smith,

I am writing to inform you that your order has been shiped today. It will deliver in 3 to 5 bussiness days. Please let me know if you have any questions or concerns.

Regards,
John"

Please provide corrections and suggestions for the text above.
'Dear Mr. Smith,

I am writing to inform you that your order has been shipped today. It will be delivered in 3 to 5 business days. Please let me know if you have any questions or concerns.

Regards,
John'