At What Point Does A Shakespeare Say

At what point does a Shakespeare say:
"I feel it's time I write a play.
What subject shall it be today?
A tragedy I've done;

"Lovers twain have been united
Audiences are delighted
No doubt I shall soon be knighted
Royal fame I've won;

"The Queen has come to every show
And, flattering, she feigns to know
A couplet from a verse, also
A refrain from a rhyme;

"But the ones I aim to pleaseth,
Most of all, upon my kneeseth
Are the folk who cough and sneezeth
Through my prose sublime"?