Well said, Sukhdeep Singh jeeo and Kawaljit Singh jeeo.
Indeed, it is exactly according to Gurmat to bow before or even prostrate before Sangat of Gursikhs, even if there is no Prakash of Siri Guru Granth Sahib jee. Guru Sahib apart from being Shabad-roop is also Sangat roop.There is no controversy on this issue.
One should always stay bowed before Bhagats as per this Gurbani Pankiti:
ਭਗਤ ਜਨਾ ਕਉ ਸਦਾ ਨਿਵਿ ਰਹੀਐ ਜਨ ਨਿਵਹਿ ਤਾ ਫਲ ਗੁਨ ਪਾਵੈਗੋ ॥To show us how important it is to stay humble before Gursikhs, the above Gurbani Pankiti has declared that only then one would receive the reward or phal of Bhagti if one stays humble before Gursikhs (ਤਾ ਫਲ ਗੁਨ ਪਾਵੈਗੋ ). The word ਤਾ indicates a condition.
Kulbir Singh