Covid in Asthmatic Elderly person.

My in laws are in their 80s and have chronic asthma. They are under medication ie. Medicines and nebulisation. They got their Covid vaccine second dose on 19th April and started getting fever from 20th April. It was suspected Covid as my husband got positive on 20th Apr as well. We didn't get our parents tested for Covid as home sample collection was not available and moreover they are too weak to go for tests. They are experiencing a lot of weakness and their Spo2 levels ranges from 83-90.  Fever ranges from 99-100 degrees on and off in a day. We are giving PCM for fever and Vitamins like C and Zinc. They don't complain of any shortness of breath but only weakness. Due to which they sleep all day. It has been ten days now..we are worried if we should take them to a hospital or keep an oxygen cylinder handy ..plz advice. Since my husband's isolation is going to over...so we are in a position to take them to a doctor now.. please advise.