They've put enough wins in the bank that it's hard to see them not making the playoffs, but I still don't think they are sustainable. They are on pace for 103 wins, for goodness sakes.
Only five of their nine starting position players have an OPS+ over 90. One of those is Steven Kwan with a 173 and that's definitely not sustainable.
Only two of their five most-used starters have an ERA+ over 80 and those are just 109 and 127. They've had great health, with the exception of Gavin Williams, who just came back, so they haven't needed to dip very far into depth.
The bullpen has been lights out though. However, a couple are on pace for 75+ innings, a couple more at 70+ and a couple more at 65+. It's hard to see not having some of those guys breaking down and having some serious overall regression.