The Bootstrap 4 Navbar uses flexbox, so it’s possible to achieve this without extra CSS. You will need an empty spacer div to keep the logo centered.
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="collapse navbar-collapse w-100 order-1 order-lg-0" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
<div class="d-flex w-100 order-0">
<div class="w-100">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
</div>
<a class="navbar-brand text-center w-100" href="#">Navbar</a>
<span class="w-100"></span>
</div>
<span class="w-100"></span>
</nav>
Toggler left, brand center:
https://www.codeply.com/go/VfuMAtIoXi
Related:
How to center nav-items in Bootstrap?
Bootstrap NavBar with left, center or right aligned items