The 50K personal and 60K business make getting the companion pass super easy right now. DH signed up for both, we met the minimum spend, and we are just waiting for the bonus points to post. We have a year and a half for the companion pass, made better in that I can travel with him to his conferences for free on company paid tickets.
I got the 50K personal 50K business 4 years ago to use for a Disney trip and other travel. That time, we signed up in early December, met the minimum spend from Christmas and a January birthday and business computer upgrade, and then bought flowers and birthday packages for our siblings with birthdays the end of January/ early February to get the bonus SW points (1750 each purchase at the time) to bump up points to 110K (that Flowers.com bonus counting towards companion pass has ended).
IMHO, unless you have no travel planned for the rest of this year, or you really need the companion pass for 2019, getting the cards now and just getting the points for $5000 in spend between the 2 cards in 3 months is really nice and a lot easier than topping off your account with $5000 in extra spend as quickly as possible. It depends on your needs and how much/how fast you spend money.