The Bayern Munich striker struck twice in last night's 5-0 win in Latvia which saw England qualify for next year's World Cup.
Tuchel revealed afterwards: "Harry just gave a speech when he said that everyone will be ready to keep this thing going in November, that no-one will step back and take this thing for granted. They feel they're building something.
"If you just look at the goal in the 85th minute, the goal from Ebs (Eze), we have a ball lost and Harry goes all the way back to his own half and puts his head down in another sprint defensively.
"As a captain, as number nine, there is no real need to do this. No-one would ever blame him if he did not do it but he does it and that is the standard and that is the example that he sets and what everyone feels at the moment.
"And that is so brilliant to see as he helps us win the ball and in the end results in the goal from Ebs, a brilliant goal.
"Harry is ready to put in the intensity and the shift that is needed. It is a pleasure to have him. He is in excellent shape physically, mentally, in top form, top shape. So everything fine."