My youngest is also 22 months, and is definitely not "speaking properly" by some definition, though he sounds like he's a little further along than yours - he puts 3-5 words together ("Not do that", "Stand up", etc.). Definitely not sentences or anything else I'd call "properly", but quite in the normal range for a child of that age from my experience.
There are definitely a variety of different ability levels when it comes to speaking; 22 months should be able to say some words, but it sounds like he's at that level. Boys tend to be further behind than girls in terms of speaking, and if he's an only child (or a first child) then it's also going to delay things some in terms of sophistication (speaking in sentences, for example).
Putting him in a playhome (I assume this translates to 'daycare' of some form) will neither help nor hurt him in this area, as long as you're regularly interacting with him when he is at home; if you're busy (a lot of cleaning/cooking, or online education classes, or such) then it likely would help him; children learn to talk by hearing others do it, first and foremost, so if he's around people who talk more around him (both his-age and older kids, and the teachers) he'll be able to improve.
You should be seeing your pediatrician at around 2 years old, hopefully, and during that visit you should discuss this concern with her/him. Your pediatrician is able to help you understand exactly what you should be concerned with. He/she can test your son's hearing, which is the most common problem related to speech; particularly if your son had more ear infections than is typical for a child (more than 3 that required medication, I think) this is a good thing to check.
I recommend filling out an Ages and Stages questionnaire for his age, such as this one which is appropriate for 24 months. This gives you a checklist that will help you answer questions when you go to your appointment; many of the questions the doctor should ask are on this sheet. Do not expect your child to do all of the things listed - it is intentionally including some things that would be well above age level (I've always felt as an honesty test, largely, though I don't know for sure) and every child certainly develops differently, so different children would be at different levels in this questionnaire.
All in all, I think that your son is not necessarily particularly behind in speech; but that doesn't mean you shouldn't stay on top of things, as if it turns out he is developmentally delayed in this area, the earlier you address the problem the better it is for his future.