The lectures are recorded, and the lecturer uploads their handwritten notes (made during the lecture) fairly quickly after every lecture. On top of that, the course notes can be purchased from Kopystop. So as long as you keep up, you should be able to still do fine without going to lectures.
That said, I didn't regret waking up at 6am every Thursday and Friday to attend those 8am MATH1901 and MATH1903 lectures for an entire year. Plus, according to rumours, this year's MATH1901 lecturer should make those early mornings worth it.