Shumar and Tatum have both said several times even a week ago that they don't believe they'll go beyond PG13. They might push the boundary in some places but in terms of language and graphic violence (the main reasons Deadpool and Logan got their rating), but that's it. If it goes R it'll probably be due to sexual content, but that would need to be a whole lot of it, not generally something we've seen from Tatum... outside of Magic Mike. I'd expect "Thriller-level" sexual content. Lots of it, but not lude and graphic... trying to think of a movie that has the level I'm talking about and all I can think of is Basic Instinct (not the tone, but the amount of sexual content that made it rated R. Wasn't shy on language either).