So from real time observation we know viruses and bacteria can mutate and have small delta changes in their DNA.
From this we can deduce that over long period of time many small changes can equate to big changes in DNA.
Because we know DNA describes macro characteristics of all living beings and effects behavior, physicality and speciation by logic we know that through induction many many small changes together equals big change and thus evolution can result in speciation and different creatures.
This is the literal conclusion through Direct observation and the inescapable logic of induction. Not to mention it's inline with fossil evidence AND covid is clearly not the only species where we observe mutations. Mutations are observed everywhere, including humans. Cancer is mutation and selection as well.