Assuming the coffee cup is $16$oz = $1$lb = $0.4536$kg or $ \sim 450$mL
I did a quick comparison to the W54 assuming there was a linear ratio (wishful thinking perhaps), and got it to be around 8m high.
Height of mushroom cloud: $1450$ ft
Weight of bomb: $58.1$ lb
Volume of bomb: $5.85$ inches in diameter, $15$ inches long
Assuming comparable height-to-weight ratio:
Mushroom cloud height of $16$ oz ($1$ lb) bomb = $1450$ft / $58.1$ lb $\times$ $1$lb $\sim 7.6$m
Assuming comparable height-to-volume ratio:
Cloud height of $16$ oz ($454$ mL) bomb = $1450$ft / $(\pi 5.85”^2 \times 15”) \times 454$ mL $\sim 8.3$m
But I'm curious what a more realistic value might be, assuming it was designed for that size and assuming maximum efficiency. Thanks in advance.