You have applied for a job. You are curious what it can pay. Would the interviewer be upset if you asked what the expected pay range is for the position?
In some jurisdictions private employers must disclose the pay range. If you live in one of those places and you are asking for a remote position, it may be legally required for the employer to disclose it. You can then have an idea of what the job can pay. This can help you negotiate a higher salary or not waste time.