Because this is a proprietary commercial font from Monotype, you cannot legally download it for free from "font aggregator" sites without risk of malware. Here are your safe options:
The script itself, Gurmukhi, was standardized in the 16th century by Guru Angad gurmukhi mt font
Go to Settings > Time & Language > Language > Add a language and select Punjabi. Because this is a proprietary commercial font from