Question

Is Las arepas tuyas son mejores present progressive tense?

Answer 1

Nope.

Present-progressive is when we're talking about something that's happening or being done, right now, in the moment.

For example,
"I am running."
"You are eating."
"We are talking."

Those are all present-progressive sentences.

Let's look at your sentence:

"Las arepas tuyas son mejores."
It means "Your arepas are better."

There's no action that's happening, in the sentence. You see?