Timeline to get into saudi after receiving offer letter?

Hi All,
On Nov23-2017, i received offer letter from saudi. i signed and sent them back immediate. After 2 weeks they asked me to get my degree certificate attested from saudi embassy in india. Iam done with HRD & MEA. But, for Saudi embassy attestation, my offer letter attested from CoC-KSA is required it seems.
So, i requested the same to my employer in saudi 2 weeks back. But, no response from their side. Even after couple of reminder there is no response.
So, please let me know how long it will take for them to send my offer letter attested from CoC?
Also,  let me know when i will get VISA?

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