There is a covid extension at the moment which allows you to extend for two months. This may not be ongoing by the time you get here and your tourist visa runs out though. The border situation for a visa run may not be viable either as it's to far in the future. If it was then you could cross to obtain another tourist visa.
you apply for a 30 day extension at the discretion of immigration. You need your embassy letter and copies of email correspondence with them. Plus residency documents.