The online link is your best option to track your refund. I have attached a link with more answers from the IRS as to why your refund may be taking longer to process.
There is a delay in processing the returns as the IRS just started processing paper returns again but due to Covid-19 and social distancing policies in effect they are 8 weeks behind ... all you can do is wait patiently.
Go here for stimulus info: https://www.irs.gov/coronavirus/economic-impact-payments
This FAQ site may also answer your questions.