Can drastically improve your SEO ranking

Sets an immediate first impression for searchers (they see it on the right-hand side when they search for you)

Integration with maps makes it much easier for your customers to find you

Faster communication. Customers can send messages directly to your company phone or email.

Reviews are displayed under your profile, which gives you credibility.

P.S. Please, please, please always update your business hours on GMB, even if they change for a short period of time (which is not uncommon these days). It really is bad for your reputation if your profile says you are open, and

you are not.