Daly scored his 11th header of the season in the 3-0 victory over SPFL League One rivals Ayr United at the weekend.
That effort took the big Irishman's tally for the 2013/14 campaign to 18 in all competitions.
The 30-year-old, who joined the Gers from Dundee United on a free transfer during the summer, has struck up a formidable partnership with Nicky Clark.
His manager reckons his aerial ability is up there with anyone he has ever seen at the Glasgow giants.
And the all-time record Rangers goalscorer was paired up front alongside both Hateley and Johnstone in his 15 year spell at the Govan club as a player.
McCoist said: "Jon is doing great and even in the games where centre-halves are combatting him and holding their own.
"He's one of these strikers who always gets a chance.
"You can't take your eye off him for one second, you really can't, and that has proven to be the case a lot recently.
"We're just thrilled with him at the moment and he's certainly as good a header of the ball as I've seen in a long time."
Speaking on the official Rangers website, he added: "He's as good as good as anyone I played with at that.
"And I played next to big Derek Johnstone and Mark Hateley. They were two of the best.
"Big Jon is definitely up there.
"He's a really powerful header of the ball and clever with his direction of headers.
"He's doing really well and long may that continue."