Primarily, yes. However, some modern PDFs include a transliteration (Romanized Punjabi) for English-speaking youth. Be cautious—transliterations often lose the tonal nuances of Gurmukhi.
Disclaimer: This article is for informational purposes. Always consult a recognized religious authority (Panj Pyare or Head Granthi) of the Nanaksar Sangat regarding the correct practices for Nitnem.