Regarding Abstract of Thesis

Hello, I'm applying for PG from Brazil.

I graduate in December 2026, but will apply in May with a prospective graduation letter.

I will write a thesis (right now, me and my advisor are meeting once every two weeks and I'm only reading the material I selected, I haven't written much yet, but I have a theme), which will be completed by November.

My question is:

Do I 1. write an abstract even if it might not be the final version (because I would consider the right moment to write it when I'm mostly done with the work) or 2. not include it?

I'm afraid I'll have issues either way.

I'd be glad if anyone could advise me. Thank you!