我可以在等待异步功能时设置变量值吗？

I have an async function fileUpload() which uploads files to a server and returns a promise when it is done. When a user wants to submit a different form, the submitForm() will await fileUpload before posting the form.

While it waits for await fileUpload, I would like to tell the user that the system is waiting for uploads to finish. Here is what I imagined (but obviously cannot work):

async fileUpload() {
   await Promise.all(
   // Does a for loop here and uploads all files
   )
}

async submitForm() {
  const FormBody = new FormData();

  await fileUpload; // I want to set this.IsUploading = true if awaiting. If not awaiting, then this.IsUploading = false; 

  this.$axios.post('/api', FormBody)
}

I use await fileUpload without the parenthesis because if I do await fileUpload() then it is invoking that function again. But how can I set this.IsUploading to true while awaiting for fileUpload() to finish and then set it to false if there is nothing more to wait for?