Try using a stepper instead of a form. Tabs are often used as a UI space tradeoff for complex details, and don’t imply any actions or sequence.
I might not have the details of your use case, but it seems if it’s a form, you want to suggest there’s component parts of a total entity.
[material stepper] is one option, and you can number the steps as an option as well. I’m not sure if your form has lots of optional elements, so in that case you might not need a ‘done’ checkmark for a section.