Are the two sentences grammatically correct? No, they are ungrammatical as you intend them to be.
First things first, 'parts of speech' (aka, 'word class') such as 'adjective' are originally used to classify words based on their grammatical functions, but not to classify phrases or clauses based on their grammatical functions.
You can classify phrases using 'parts of speech' such as 'noun phrase', 'adjective phrase', 'verb phrase', etc. But this classification of phrases is not based on their grammatical function but on what part of speech the head of a phrase is classified as.
For example, if you classify a phrase as an adjective phrase, it's not because its grammatical function is similar to that of an adjective but because the head of the phrase is classified as an adjective:
I have a train to catch. [Here, to catch is not an adjective phrase but a verb phrase.]
I'm afraid of him. [Here, afraid of him is an adjective phrase.]
Now, turning to clauses, the head of a clause is always a verb (except for verbless clauses). Therefore, I'm afraid it'd wrong to classify your clauses as 'adjective clauses' simply because the clauses have a postmodifying function that is not even exclusive to 'adjective', as in:
The time when is good for us to meet has not been decided.
The person who is qualified for the job will be appointed soon.
Suffice it to say they are relative clauses.
Now the examples you ask the question about are:
(1) When is good for us to meet has not been decided.
(2) Who is qualified for the job will be appointed soon.
If (1) is to be a natural sentence, the boldfaced portion has to be an interrogative clause, where When is an interrogative word as in When is good for us to meet?
But this interpretation doesn't seem to be what you have intended.
(2), on the other hand, cannot work as is, however you interpret it, because here the boldfaced portion cannot even work as an interrogative clause due to the meaning of the main clause will be appointed soon.