qualifying surviving spouse

My spouse died in 2020. I was able to file joint for that year.  For 2021 I had to file single and paid a lot of estimated tax.  My 52 year old son has lived with me for about 5 years and has always worked or drawn unemployment.  In 2022 he had NO income at all.  I supported him.  I put him as a dependent and Turbotax says I can file as a qualifying surviving spouse.  He is 52 years old.  This gives me an extremely large refund from federal and state.  I'm nervous about this and want to make sure I am doing this right.