Note I used AWS CLI V2 for this – not certain if it works with V1 but it is easy enough to upgrade to V2 which has been out for some-time.
I’ll start off by saying, this is a very common requirement in my humble opinion and AWS as usual does a poor job of documenting – with ZERO applicable examples.
Note: the quotes are required.
aws ec2 describe-instances --filters 'Name=tag:Name,Values=imply*' --profile myprofile