Assuming you were accepted for May 2019 intake, you can travel any time from now as long as you can prove that you can sustain yourself before your studies begin.
First of all, congratulations! And assuming your course will start in May '19, it's better to land there 2-3 weeks before the course starts. As you won't be able to work until the commencement of your course and you will have to sustain yourself, also the airport authorities might doubt you and send you back.
