Could you please guide if hard copy SSCP certificate is also shipped? If so, when can I expect? I got certified in the month of Dec 2018.
Yes, all members should should receive a hard copy of their certificate(s) after endorsement, and again upon each renewal of their 3-year cycle.
There's an FAQ for the certificate pack here:
Sounds like you need to contact Member Services and ask for a replacement to be shipped. I'd also check that your postal address is set correctly in your profile in the member portal.