In whose reign did the Sultanate reach its farthest extent?

The imperial kingdom reached its furthest extent during the reign of Muhammad Tughluq. He reigned from 1324 to 1351. 

Military expeditions to southern India began during the reign of Alauddin Khalji and culminated with Muhammad Tughluq, 

At the end of Muhammad Tughluq's reign, 150 years after somewhat modest beginnings, the

The army of the Delhi Sultanate crossed most of the subcontinent

During the reign of muhammad tugluq from 1324 to 1351.delhi sultanate crossed the most subcontinent