One of the (few) benefits of lockdowns is that many churches were forced to go online and many continue to hold online services, so you can actually 'visit' several churches on a Sunday morning by logging in and out and just getting a feel as to whether it'd be a good fit. 'Try before you buy' if you see what I mean. 😂
As for my church, we're a small group of about 30, all from different walks of life. We've got a few married couples and then some people who are divorced, widowed, one chap whose wife isn't a Christian - a real mix. I actually trained the welcome team so they know how to welcome people in a balanced way. If someone is new, they ask them their name but no personal questions and if they're alone, they ask if they'd like to be introduced to someone to sit with or if they'd like to be left alone. Basically, we try to be respectful of everyone's boundaries but overall we want people to leave feeling they have been 'seen'.
I have travelled a lot with my job and so I've visited a lot of churches over the years - I could probably write a book!
And yes I do judge a church by the welcome. If I walk in and am not acknowledged by anyone, that concerns me. To me it implies people are inward focused and not looking out for newbies. Likewise, I've had a welcome which was massively over the top...in fact, one guy was SO keen to get me to sign up for their welcome pack that he followed me to the door and asked me 3 times. Desperate for new members I guess! I politely said no as I knew it wasn't the church for me and I wouldn't be returning,
All in all, hope you have a great time. Being part of a Christ-filled community is so important if you're a Christian.