The Pharaohs are on the brink of securing a third World Cup ticket in history as they currently sit two points clear at the top of Group E with two rounds of matches to go.
Victory over bottom-placed Congo on October 8 will guarantee the North Africans qualification with a match to spare.
“In football, you can never rely on your good mathematical chance to advance; it all depends on how determined, persistent and ambitious you are,” El Hadary told Fifa.com.
“I believe the current crop of players boasts all those qualities.
“We can finish the job in 90 or 180 minutes but we are taking it one match at a time and for now we are focused on beating Congo.
“We only think about Egypt and the World Cup objective, even when we eat or sleep.”
Should Egypt fail to pick maximum points at the expense of Congo, second-placed Uganda or third-positioned Ghana could turn the favour away from the Pharaohs.
The North Africans are seeking to play at the World Cup for the first time since 1990.