The Phobians produced unarguably their best performance in recent times as they handed the Academy Boys a 4-0 thrashing in the Matchday Nine fixture at the Accra Sports Stadium.
The win has taken the 2000 African champions to the top of the table in Zone B, one point above second-placed Karela United.
"I'm happy with their [players] performance today," Grant, whose Hearts tenure began in December, told GTV after the match.
"It was magnificent and it's a great feeling.
"We could have scored seven goals with the scoring chances we created in the game.
"We are in our fifth month, the team is still a work in progress."
Hearts next play Liberty Professionals in the Special Competition.