The current version of 2017 TurboTax does use the correct value of $54,000 for the regular contribution limit on line 8 of Part III of the Keogh, SEP and SIMPLE Contribution Worksheet, so no need to override that. However, it's still using $53,000 for the regular contribution limit on lines 1 and 2 of Part V, so overrides will still be needed there until an update fixes the problem.
The text on Part III line 8 has not yet been updated, but that often does not happen until the form is approved for filing.
