After the transcription of the DNA is complete, the genes encoding the amino acids for the proteins are copied onto the mRNA strand. After this, this RNA strand moves out of the nucleus. The ribosomes attaches the mRNA strand to itself and the tRNA reads the codon and brings the amino acid to the ribosome and attaches it. This process is continued till the protein is formed. This process is known as translation.
Hence, translation should be shown to complete the protein synthesis model.