This is the time

You make the call:

It was a pretty breezy Purim as far as the מגילה goes. However, there was one thing I was a little unsure of. At night, the בעל קריאה said ד:י"ד וּמִי יוֹדֵעַ אִם לָעֵת כָּזֹאת הִגַּעַתְּ לַמַּלְכוּת instead of לְעֵת. I let it go. My thinking was that the term as a whole is a definite, even if לְעֵת is indefinite. What do you say?

I would also say that in the back of my mind, I hoped that there was actually another גרסא that had לָעֵת. I have been using an Artscroll Megillah for the last while. But I have realized that it might not be as מדוקדק as I would like. Can anyone recommend a readily available new מגילה which is known to be מדוקדק?

Thanks.

תשפ"ד Update:

This came up again tonight and I actually corrected it. Although, my position has not changed that this doesn't ultimately change the meaning.