Search Results: asking out a girl on a phone

I have been seeing a girl for about 5 weeks now. We've been out several times and are sleeping together. And while I'm insanely picky (I can't overstate this), she knocked my socks off from day one. I'm getting to the point where I don't really feel like investing time in other women (which I don't really have anyway since I work so many hours).

The signs from her are mostly promising. She initiates LOTS of physical contact (taking my arm, grabbing my hand, rubbing my leg). When we spend the night she barely lets me an inch away from her, and will squeeze my hand or body as if she were dangling off a cliff. She's started offering to pay for things (e. g., "let me take you to dinner"), she's begun proposing plans instead of just waiting for me to do so (during our date: "what are you doing tomorrow?"), and she recently even suggested a mid-week sex romp (lol). So it's clear that she's into me too, BUT...

... it also would appear she's still on the apps (She received a notification while we were on her couch and her phone was right in my view. I wasn't TRYING to see it!). She also hasn't progressed to asking me much about personal things going on in my life yet. And even though we were together a few days ago and she was meeting friends for drinks later, it was clear I wasn't invited.

That said, I'm leaning toward having "the talk" in the next week or so but have apprehensions about it being 'too soon.' Some say MINIMUM of 3 months. Others seem to think one month is plenty. I've done both extremes (from 2 weeks to several months) and feel like 5-8 weeks is probably the sweet spot.

Thoughts on how to approach the subject and timing?