Is that quartz or acrylic?

Acrylic, it’s LGs version of Corian

I'd want a counter top fabricator to come and do that.

A moderately handy DIYer can handle this. I'd recommend an oscillating multi-tool. Cut up to your line without crossing it, however, the most important aspect of this job is completely removing all tool marks. You'll probably use a sanding grit protocol on a wood block or sand with the multi tool.

Cutting solid surface creates stress risers, small micro fractures. When these are subject to the expansion and contraction from heat generating appliances, they can become large cracks. Smooth stops them.

Round your top and bottom edges too please.

Thank you for the input.

My husband thinks he can tackle what Joseph described.