I did a literature review before my thesis was completed. It was very good experience, was well-received and ended up shaping a couple of my chapters really well: the ones on background and methodology. There is nothing like having peers review your chapter for you. If you don't write about your thesis in the review then you are not openning yourself up to problems. Do make sure it is a critical review though, with insights into existing gaps in the research and differences between existing work. A collection of abstracts will not be well-received. It is also a lot more work than you would think.